How much does it cost to send a BTC transaction?

I'm curious to know, how much does it typically cost to send a Bitcoin (BTC) transaction? Is there a fixed fee or does it vary depending on factors such as the current network congestion and the size of the transaction? Additionally, are there any ways to minimize the cost of sending a BTC transaction, such as using a specific wallet or adjusting the transaction fee? Understanding the costs associated with sending BTC transactions is crucial for both individuals and businesses looking to utilize this digital currency.