Understanding Minecraft Mods
Minecraft mods vs Addon are fan made changes that can add new items mobs or even change the entire gameplay. They are usually created for the Java Edition and often need extra launchers or tools to install. Mods can be very big in size and can make your game look and feel totaly diffrent.
What is a Minecraft Addon
Addons are mostly for the Bedrock Edition and are lighter than mods. They dont change the whole game engine but can add new mobs skins or small gameplay features. Addons are easy to install from the in game marketplace or by importing files.
Main Diffrences Between Mods and Addons
Mods have more power and can do deeper changes but they need more work to install. Addons are simpler but with less customisation. If you play Bedrock you will use addons if you play Java you will probebly use mods.
Which One Should You Use
If you want full custom worlds big gameplay changes and advanced features go for mods. If you just want small fun changes and quick install go for addons.