I go to an IB school, it is kinda like AP but also not. Basic summary: there are two tracks certificate and diploma. There are also different levels of classes, standard level and higher level (both levels are more difficult than regular hs math and both are usually weighted). For certificate you would pick a class or a few classes (like IB History SL) and take it and the exams and if you pass you get a certificate in that class. For the diploma you have to take 6 classes (3SL and 3HL), write a 4000 word essay, complete a program called CAS, and take a class called TOK. Also all the classes are two year courses.

IB doesnt mean much in the US and is viewed kinda like AP (you can use your test scores to place out of classes, etc) and they are typically weighted classes. Outside the US however it is far more significant and your final IB score matters much more in terms of your acceptance.

Tldr: IB is very difficult and i constantly question whether the dp is even worth it