¿Qué es la WWW?

What is the World Wide Web?

Introduction to the World Wide Web and Internet

• The video aims to clarify the meaning of "World Wide Web" (WWW), often confused with the term "Internet."

• Internet connects computers globally, forming a vast network composed of routers, signals, and satellites; it serves as the infrastructure for data transmission.

Understanding Internet vs. Web

• An analogy compares Internet to water service in a city: while internet is like pipes (infrastructure), web technologies are akin to water flowing through those pipes.

• Various services utilize the Internet, including messaging apps like WhatsApp and Messenger, which send messages via servers over the internet.

Peer-to-Peer Technology and Online Gaming

• Peer-to-peer (P2P) technology allows direct file sharing between users but poses risks such as virus transmission due to lack of control over shared content.

• Online games like Minecraft require an internet connection for multiplayer experiences by connecting players through servers.

Defining the World Wide Web

• The web consists of pages accessed via browsers (e.g., Google Chrome, Mozilla Firefox); it relies on hyperlinks for navigation between pages.

• While web pages can exist without internet access if stored locally, they require an online connection for updates and dynamic content.

Key Elements of the Web

• Essential components of the web include websites, web pages, browsers, search engines, hyperlinks, and HTML code.

• WWW stands for "World Wide Web," representing a technology based on interconnected web pages; each page is a document formatted in HTML.

Local vs. Online Access

• A webpage saved locally can be opened without internet but won't reflect real-time updates unless connected online.

• Information on the web resides on servers; accessing updated content requires an active internet connection.

Conclusion: The Role of HTML in Web Pages

• HTML coding forms the backbone of webpages; it structures documents that browsers interpret to display content visually.

• Images referenced in HTML are separate from text files but are essential for complete webpage rendering when accessed online.

Understanding Web Architecture

The Basics of Internet and Servers

• The internet is depicted as a cloud, with local networks connected through routers that serve as the heart of internet connectivity.

• When a user uploads content (e.g., a photo on Instagram), it travels from their local device to a web server located anywhere globally, such as in India or China.

• Requests for viewing content are sent from users' devices back through the interconnected networks to retrieve data stored on web servers.

Components of Web Architecture

• Web architecture consists of servers (programs running on central computers) and clients (browsers used by individuals).

• A distinction is made between websites (collections of interlinked pages) and web pages (individual HTML documents).

Role and Functionality of Browsers

• Browsers are applications installed on devices that allow users to view web pages, whether stored locally or hosted online.

• The primary function of a browser is to receive HTML code from servers and render it into visual format; slow internet can cause gradual page loading.

Navigating the Browser Interface

• Key elements include the address bar for entering URLs, which should not be confused with search boxes; specific addresses start with "http" or "file."

• Users can choose search engines directly within browsers, allowing searches without needing to navigate to the search engine's homepage.

Additional Browser Features

• Browsers feature tabs for multiple open pages, home buttons for quick access to preferred sites, and navigation buttons for moving between pages.

• Status bars indicate loading progress; it's recommended to wait until full loading before interacting with a webpage.

Types of Browsers Available

• Popular browsers include Mozilla Firefox, Google Chrome, and Microsoft Edge—Microsoft's replacement for Internet Explorer due to its poor reputation.

Understanding Websites and Hosting

• A website can be stored locally on devices like USB drives; it comprises folders containing interrelated web pages linked via hyperlinks.

Web Hosting and Data Centers Explained

Understanding Web Hosting

• The speaker explains that web hosting involves storing website files, such as images and HTML documents, on a computer's hard drive. This allows the website to be accessed via a browser.

• Web hosting is defined as an online server providing storage space for websites, enabling global access through the internet.

• After creating a website (even in Word), it can be uploaded to a hosting service that provides both a URL and disk space for public viewing.

Server Farms and Data Centers

• Server farms consist of numerous hard drives where all web information is stored. Users connect globally to these data centers to access popular sites.

• Major companies like Google have their own server farms and data centers worldwide, which are essential for delivering services efficiently.

Data Center Operations

• Google Drive offers 15 GB of free storage; however, this data physically resides in secure data centers around the world.

• The closest data center to Ecuador is located in Chile, indicating how user-uploaded content (like photos on Facebook) travels internationally for storage.

Security Measures in Data Centers

• Data centers maintain low temperatures for optimal hardware performance. They house numerous hard drives stacked together to manage vast amounts of incoming data.

• Google's data centers replicate information across multiple locations globally as a safeguard against disasters or attacks, ensuring high security for user data.

Accessing Information in Data Centers

• Despite strict ethical guidelines preventing unauthorized access, administrators at these facilities can technically view stored information but are bound by privacy regulations.

Clarifying URLs and Hyperlinks

• A common misconception is using "link" instead of "URL." The correct term refers specifically to the Uniform Resource Locator used to identify resources on the internet.

• URLs begin with "http," which stands for Hypertext Transfer Protocol—this protocol facilitates communication across the web.

• A URL consists of three main components: the protocol type (e.g., HTTP), domain address, and resource path needed to locate specific content online.

Understanding Domains and Hyperlinks

What is a Domain?

• A domain is the first part of a web address, typically containing "www," and indicates the server where information is stored. It usually ends with extensions like .com, .net, or .org.

• When uploading a website to a hosting center, users are assigned either a domain or a free subdomain. This domain serves as the identifier for their website on the internet.

• Purchasing a domain (e.g., www.puntomio.com) generally costs around $30 to $40 per year as of now. This fee grants ownership for that duration.

Understanding Hyperlinks

• A hyperlink (or link) refers to text or an image that connects to another resource when clicked, such as videos, audio files, texts, animations, images, or programs. It’s important to differentiate between hyperlinks and URLs; hyperlinks are clickable elements while URLs are the actual addresses they lead to.

• Hyperlinks are often represented by icons resembling links; hovering over them reveals the true URL destination at the bottom of the browser window. This distinction helps users understand what they will access upon clicking.

Conclusion

• The discussion concludes with an emphasis on understanding key elements of web navigation: differentiating between what constitutes the World Wide Web versus Internet and clarifying definitions related to domains and hyperlinks. The aim is for viewers to grasp these foundational concepts clearly before moving forward in their learning journey about web technologies.