Ionic and Bootstrap

I am new to Ionic framework. Just getting started with building some simple apps. I understand that both Ionic css and Bootstrap are actually complementary. But I would like to know if we can actually use bootstrap inside Ionic? Will there be any performance issues or conflicts?

ionic components are bootstrap based

thanks @Ben1nB1ack but can I use bootstrap explicitly by using the css, js and other stuff?

search google for ‘ionic 3 bootstrap’

what i have used in bootstrap, i have seen a ion- class for.

may I ask what for? why would you need bootstrap for?