Examples:
* NASA (National Aeronautics and Space Administration)
* NATO (North Atlantic Treaty Organization)
* SCUBA (Self-Contained Underwater Breathing Apparatus)
Note: An acronym is pronounced as a word, while an initialism is pronounced by saying each letter individually.
For example, "FBI" is an initialism because it's pronounced "F-B-I," while "laser" is an acronym because it's pronounced as a single word.