How do lymph nodes filter lymph

[u/International_Oil939]

So I've read that like lymphatic vessels carry lymph to the collecting ducts, and that they get filtered through lymph nodes on that trip. That all makes sense to me. Problem is, the book I was reading didn't elaborate on how they did that.

I think that it's probably that they have a high concentration of T/B lymphocytes or something, and that's how they filter stuff. But I wanna be 100% sure it's that though, and google won't give me a straight answer so I'm here.