Hypertext Transfer Protocol (HTTP) is the foundation of data communication for WWW. To comprehend HTTP, it is essential to understand the etymology of hypertext. The major constraint of written text is its linearity, that is, not being able to easily reference other text that the user can easily access. Hypertext overcomes this constraint, with the concept of hyperlinks, which allows the user to easily navigate to the referenced section. HTTP is an application layer protocol that defines how hypertext messages are formatted, transmitted, and processed over the internet. Let's have a quick recap of HTTP in this section.