A cookie is an HTTP request header i.e. used in the requests sent by the user to the server. … It is an optional header.
The Set-Cookie header is sent by the server in response to an HTTP request, which is used to create a cookie on the user’s system. The Cookie header is included by the client application with an HTTP request sent to a server, if there is a cookie that has a matching domain and path.
The Set-Cookie HTTP response header is used to send a cookie from the server to the user agent, so that the user agent can send it back to the server later. To send multiple cookies, multiple Set-Cookie headers should be sent in the same response.
