Confusion about asp.net core mvc, asp.net mvc 6 and asp.net 5

i have worked with asp.net mvc 4/5 but i like to know when we can call a project mvc6 ?

when we developed a asp.net mvc project with VS2015 then project will be consider mvc 6 ?

or when we develop project with asp.net core mvc then project will be consider mvc 6 ?

what is asp.net 5 ? is it same as asp.net core ?

please do not delete my post because i have confusion in my mind and i search google to get my answer but failed. so please guide me about when project should be called mvc6, when asp.net core mvc and what is asp.net 5 ?

write few to explain it to guide me.

thanks