Abstraction means hiding all the messy details and keeping only what's IMPORTANT. A spell has a thousand steps โ but you just say "Fire Shield!" and it works. You don't need to know every tiny detail. That's abstraction! Coders do this too โ they give ONE name to a whole bunch of code so they can use it without getting lost in details.
๐ Remember breaking the big concert into small parts (Decomposition)? Now take the next step: look at ALL those parts and ask โ "What's really important here?" Then hide the rest. That's ABSTRACTION!