HTTP (Hypertext Transfer Protocol) is a protocol used for transmitting data and serves as the foundation for all data exchange on the internet. It defines how data is sent and received but does not concern itself with the specific content of the data. It can be used to transmit any type of data, such as HTML pages, images, and videos.
REST (Representational State Transfer) is a software architectural style that uses the HTTP protocol to organize and process data. REST is commonly used in the APIs of web applications to provide an efficient, reliable, and maintainable way to handle data. In a RESTful architecture, data and functionality are considered resources and can be accessed via URLs (Uniform Resource Locators). These resources are transmitted over the network using standard HTTP methods such as GET, POST, PUT, and DELETE.
For example, in a RESTful API, you might have a URL path to retrieve user information, such as /users/{id}. When a client sends a GET request to this URL, the server responds by returning the requested user information. If you send data using the POST method to /users, it may create a new user.
In summary, HTTP is a protocol that defines the method for transmitting data between clients and servers; whereas REST is an architectural style that leverages the HTTP protocol to create and design APIs for web applications. Through REST architecture, developers can create web applications that are structurally clear, conform to standards, and easy to maintain.