Imagine a bank account - every movement of your money is recorded as an individual transaction, so it is transparent and you always have an overview of what happened. You don't wanna lose track of your money, right?
Well, that's also what our transactions are for. Every modification of your account balance (the number of points you have) is recorded as a separate transaction with a timestamp and a type.
A transaction always has a type which indicates to what it belongs - e.g Survey, Server Minutes, Promotion, Referral etc.
You can see a list of all the transactions for your account in the User Panel.