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HDD

Hard Disk Drive or Hard Drive is the device normally used for local storage of the operating system and user data on a PC.

HTML

Hyper Text Markup Language

Hyper Text Markup Language (programming for Internet web pages)

HTTP

HyperText Transfer Protocol 

is one way information sent over the internet; travels over the phone lines from a server to  local computers. 

HTTP is the standard set of rules that Web browsers rely on to load a Web page from its location on a server and translate the programming and scripting languages.

HTTPS

HyperText Transfer Protocol (Secure)

is a variant of the protocol that adds an extra layer of encryption to the data to secure the connection. This prevents unauthorized users from accessing the data.