In line skating is a multi disciplinary and is a sport that's practiced all around the world
I didn't realize it was that popular. Where did it start?
Yeah its very  popular .  Not much info on that but i did find that inline skates typically have 2 to 5 wheels
I wonder if they have a brake pad too like roller skates?
Not much information but it does state that in line skates design does allow for much greater speeds
I wonder if they have a contact sport like roller derby lol
Not that i have found ha but that would be great to watch.  In line skating has another name called roller blading
Makes sense, roller blades have a single line of wheels, so...inline.
demarcation
Disciplines Speed skating.
Also known as inline racing, speed skating is the sport of skating (usually on flat surfaces, such as roller-rinks) with the intent to beat the opponent's time score or get to the finish line first.
Disciplines Vert skating.
A term used to refer to inline skates on a vert ramp, a half pipe with some vertical in it usually between 6in to 24in. Vert skating is a form of gymnastics performed with skates. The purpose of vert skating is
Inline skating
Inline skating is a multi-disciplinary sport and can refer to a number of activities practiced using Inline skates. Inline skates typically have two to five polyurethane wheels, arranged in a single line by a metal or plastic frame on the underside of a boot. The in-line design allows for greater speed and maneuverability than traditional (or "quad") roller skates. Following this basic design principle, inline skates can be modified to varying degrees to accommodate niche disciplines.
Inline skating is commonly referred to