Sorry, can someone do a ELI5?

What does it mean to be React-like? Is it a drop-in replacement? Are React components compatible? Or it just looks like React (it does)?

I'm going absolutely crazy trying to keep up-to-date with all frameworks coming out nowadays.

Yesterday it was Svelte, today it's Inferno.

What's good about using this instead of React? 3k of parsing instead of 40k is a huge improvement, but can we still using stuff that was made for React?

I'm lost.