The HttpContext class is the core of ASP.NET Core. HttpContext is the object that gives information about current requests and responses, for example, you can get information about the current request headers, query strings, request body, content type, and much more. This class is improvised in ASP.NET Core, and a few more methods have been introduced.

In terms of security, they have introduced a new property known as authentication that returns the AuthenticationManager object. AuthenticationManager provides some methods to check whether the user is authenticated and it performs user sign-in and sign-out operations.