Description: A request header is a header included in a client’s request to a server. These headers are fundamental in the HTTP protocol, as they allow the client to send additional information to the server about the request being made. Request headers can include details such as the type of browser the client is using, the preferred language, and other relevant data that may influence the server’s response. Additionally, request headers can be used for authentication, specifying tokens or credentials needed to access certain resources. In a broader context, request headers play a crucial role in optimizing content delivery across web applications, allowing developers to customize how requests and responses are handled, thus improving the end-user experience. In summary, request headers are an essential part of the communication between clients and servers, providing a means to exchange critical information that can affect both the security and efficiency of web interactions.