A fair reply to "How to withdraw usdt from an exchange?" starts with what a stablecoin promises. USDT, the ticker of the Tether token, is a stablecoin: a crypto token built to hold a steady value equal to one unit of a major traditional currency. Players use it to move money into and out of casinos without the daily price swings of bitcoin. What USDT is, how it works, whether it is safe and how people get it are distinct questions, and each has an honest answer with its own limits.
How does USDT work? An issuer, Tether, creates new tokens when clients deposit traditional money and destroys tokens when clients redeem them. The issuer says each token is backed by reserves of cash, short term government debt and other assets, and it publishes periodic reports on them. Redemption at full value is offered mainly to large verified clients; everyone else trades USDT on exchanges at whatever the market pays, which usually sits very close to the anchor value. The tokens live on public blockchains, so USDT can be sent like any other coin.
What is USDC? It is another reserve backed stablecoin, issued by a different company from the one behind USDT. The difference between USDC and USDT lies mainly in the issuer, in how each discloses its reserves and in where each is listed. Both publish reserve reports with different detail and different levels of outside checking, and both have faced criticism. For a casino payment the gap is narrower: the cashier must accept that exact coin on that exact network, and USDC sent where USDT is expected can be stranded.
How to buy USDT usually comes down to two routes. A regulated exchange is the first: the buyer opens an account, verifies identity and funds it by card or bank payment, then keeps the coins there or withdraws them to a personal wallet. The other route is a person to person deal inside the exchange, where the platform keeps the coins locked until the seller confirms the payment arrived. Such deals carry their own traps, from money that turns out to be stolen to counterparties who ask to finish the trade outside the platform, where no protection is left.
More questions
Why keep person to person deals inside the platform?
Inside the platform the coins sit in escrow and disputes can be raised; a deal finished outside it has no protection at all.
Who publishes reports on USDT reserves?
The issuer publishes periodic reports on the cash, short term government debt and other assets it says back each token; ordinary holders cannot inspect the reserves themselves.
How do people usually buy USDT?
Through a regulated exchange that checks identity and takes card or bank payments, or through a person to person deal held in escrow inside an exchange.
What is the difference between USDC and USDT?
Both are reserve backed stablecoins, but different companies issue them, disclose their reserves differently and list them in different places.
Why must the network match on both sides of a USDT transfer?
The same coin runs on several networks, and coins sent on a network the receiver does not support can be stranded.