Emoticons ;)

An emotion is how you feel and express yourself through body language.

An emoticon is some type of face/recognized emotion that is created through the keyboard to describe that particular feeling or emotion.

--- 10 Examples of Emoticons and What They Mean are:
:) happy
:( sad
:D excited
;) wink
.-) pirate
: straight
D: mad face
:-Q smoking
:----( sad with long nose
:} ) happy with mustache

An acronym is an abbreviation of words.
--- 10 Examples of Texting/IMing Acronyms:
BRB - be right back
g2g - gotta go
TTYL - talk to you later
LOL - laugh out loud
L8 - late
U - you
THX - thanks
Y - why
BWLN - bowling
NVM - nevermind