A reader asking "How to pay with usdt?" is measuring coins against bitcoin, the one most people meet first. Players who pay a casino in crypto often weigh it against USDT or Ethereum, wonder whether bitcoin and cryptocurrency mean the same thing, and ask whether holding it is allowed at all. Each comparison below takes one of those questions, explains what sets the coins apart, and says nothing about where any price is heading.
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Is bitcoin the same as cryptocurrency? No: bitcoin is one cryptocurrency, the first and best known, while the word covers thousands of coins and tokens built on similar ideas. Some, like bitcoin, have no central issuer; others, like USDT, are issued and managed by a company even though they live on public blockchains. Treating every coin as a copy of bitcoin hides real differences in who controls the supply, what backs the value and how the network charges for transfers. Comparing bitcoin with any other coin starts with those three questions.
Bitcoin vs Ethereum comes down to purpose and design. Bitcoin was built mainly to send and store value, and its network does little beyond that. Ethereum is a platform that runs self executing contracts, small programs that execute on the chain, and thousands of tokens are issued on top of it, including one version of USDT. Its own coin, ether or ETH, pays the gas for every transaction there, so a wallet holding only tokens still needs some ETH before anything can move. The two coins have separate networks, prices and address styles.
Is bitcoin legal? The answer depends on the country, and no single rule applies everywhere. Some countries regulate buying, holding and exchanging it, some restrict how banks or businesses may deal with it, and a few ban it outright or ban key uses of it. Tax rules differ just as widely, and many places treat selling or swapping coins as something to declare. Rules also change over time, and a website that opens in a browser proves nothing about whether using it is permitted. Local rules are the only reliable answer.
Centrally issued tokens such as USDT can be frozen at specific addresses by their issuer; bitcoin has no issuer that could do so.
Bitcoin was built mainly to send and store value, while Ethereum runs programs on its chain and hosts thousands of tokens.
No. Some countries regulate it, some restrict it and a few ban it or key uses of it, so the local rules decide.
Every transaction on Ethereum pays gas in ETH, so a wallet holding only tokens cannot move them without some ETH.
No. Bitcoin is one cryptocurrency, the first and best known, among thousands of coins and tokens.