system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Different bullet types and their pros/cons

Particularly your basic bullet, full metal jacket and hollow points.
gpt
Full metal jacket means that the lead bullet has a thin coating of metal around it.  These bullets are pointed at the tip.  Pros: Since the lead is coated there is less residue in the barrel after shooting.  Con(?): Since the tip is pointed and covered in hard metal, this kind of bullet pierces without expanding much.

Soft tip bullets have a flat tip with the lead exposed.  These expand a bit when hitting the body (meaning, more damage) but are a little dirtier in the barrel.

Hollow points are soft tips with a little scoop taken out so that they really expand when hitting something.

Armor piercing bullets have a hard little core of VERY hard metal so that when the bullet smashes into something hard, the metal core punches through it.