You send: Cardano (Binance Smart Chain)
ADA is the native asset of Cardano, a proof-of-stake blockchain developed through peer-reviewed research. It is used for fees and staking on that network. More about Cardano.
On this pair it moves over BEP20 — an address there starts with 0x — 42 characters.
ADA also exists on other networks — different addresses, not interchangeable: Cardano.

