Semisimple

Okay, imagine you have a bunch of toys. Some of these toys can be taken apart and separated into smaller pieces that are still toys. These toys are like the building blocks of bigger toys.

When we say an object is "semisimple," we mean that it can be broken down into smaller pieces that can't be broken down any further. These smaller pieces are called "irreducible" and they're like the building blocks of the object.

So, just like how we can take apart toys into building blocks, we can break down a semisimple object into its irreducible building blocks. And just like how we can't take apart building blocks any further, we can't break down irreducible objects any further. They're the smallest, simplest pieces that make up the semisimple object.