When using OpenVPN, you can choose between two ways to send your data over the internet: using UDP or TCP. Think of UDP and TCP as different types of delivery trucks.
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UDP: This is like a fast delivery truck that doesn't stop to check if every package is delivered correctly or in order. It just keeps sending packages quickly, which is great for watching videos or playing online games where you want things to move quickly.
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TCP: This truck is more careful. It makes sure every package is delivered correctly and in the right order. If something goes wrong, like a package is lost, it will send it again. This makes TCP a bit slower than UDP, but it's good when you need to make sure all your data arrives correctly, such as when you're downloading a file.
So, if you're looking for speed and don't mind if some data gets lost along the way (like when you're streaming or gaming), UDP is the way to go. But if you need all your data to arrive safely and in order (like when you're sending an important email), TCP is a better choice.
