what is httpcontext and httphandler in asp.net code example

Example: httpcontext in .net standard

namespace System.Web
{
    public static class HttpContext
        {
            private static Microsoft.AspNetCore.Http.IHttpContextAccessor m_httpContextAccessor;


    public static void Configure(Microsoft.AspNetCore.Http.IHttpContextAccessor httpContextAccessor)
        {
            m_httpContextAccessor = httpContextAccessor;
        }


        public static Microsoft.AspNetCore.Http.HttpContext Current
        {
            get
            {
                return m_httpContextAccessor.HttpContext;
            }
        }

    }
}