Acronyms :

Definition:
A word formed from initial letters of other words and pronounced as a word.

SONAR (Sound Navigation And  Ranging)

NAVSAT (Navigation Satellite)

LASER (Light Amplification by Simulated Emission of Radiation)

Abbreviations :

Definition:

A shortened form of a word or phrase.

MRI (Magnetic Resonance Imaging)

API (Application Program Interface)

CMS  (Content Management System)

Jargon :

Definition:

Special words or expressions used by a profession, group or a company that are difficult for others to understand.

URL (Uniform Resource Locator)

HTTP (hyper text transfer protocol)

HTML (Hyper text markup language)