What is implantation bleeding

Jae

Can someone please explain to me what implantation bleeding in with details descriptions because I don't know what it is and trying to Google what it is what it looks like is it supposed to have a smell that is smell different than a period does it look different than the period I'm confused yes I have a five year old but ain't nobody explain these things to me and I'm really trying to figure this out because this period or this cycle that I am on I can wear tampon all day and take it out and there's barely anything on it and if it is it's brown and look old and stuff I don't know can somebody help please