How much is Uniswap swap?

Excuse me, I'm a bit confused about the pricing of Uniswap swaps. Could you please clarify for me? I understand that Uniswap is a decentralized exchange that allows for the swapping of tokens, but I'm unsure about the exact cost or fee structure involved in these swaps. Is there a fixed fee for each swap, or does it vary based on the tokens being swapped or the amount being exchanged? I'd appreciate any information you could provide to help me better understand the costs associated with using Uniswap for my transactions.