Non-Fungible Tokens (non-substitutable Tokens) mean that each one is unique and different from any other. NFTs are sometimes called Collectibles. Traditional ERC20 tokens can be called Fungible tokens because each of them is interchangeable and has the same value. For example, 1 USDT-ERC20 owned by you and 1 USDT-ERC20 owned by others are equivalent, and both have a value of 1 U.S. dollar. In many scenarios, the value of the token is not equivalent. For example, the values of 10 items in a specific game are different from each other. Or, we tokenize tickets for a football game and sell them, because different tickets ave different values for different seats. In order to distinguish different tokens, a different token ID is set for each token to distinguish it. The Doge Fighter below is a ERC 721 token minted on Binance Smart Chain. All NFTs are not created equal, which is clear when comparing the ERC-1155 and ERC-721 token standards. A token standard is a set of rules t