Where do I get a trade link?

Excuse me, could you please elaborate on where exactly one might acquire a trade link? I'm a bit unfamiliar with the terminology and would appreciate some clarity. Is it something that's obtained through a specific platform or exchange? Or is there a specific process that one needs to follow in order to secure one? I'm looking to get involved in cryptocurrency trading and would love to know the most efficient way to go about it. Thank you for your time and assistance.