On this page, HTTP & https full form is given below with a short description.
Basically, HTTP and https full form are the same and S stands for security/secure in HTTPS.
HTTP full form & the full form of HTTPS.
The full form of HTTP is hypertext transfer protocol and the same for HTTPS but completely https full form is hypertext transfer protocol secure.
The word HTTP or https we always see in pre of the website URL or address.