The Necronomicon

Gas Tank

To pay for your script executions
The Gas Tank is where the user deposits coins or DAEM to pay for their script executions.
While the UI shows 2 components (Gas Tank and Tip Jar), they are actually both part of the Gas Tank smart contract, that takes care of both functionalities.
One of the conditions for the scripts to become executable is that the script owner must have enough coins deposited in the gas tank to cover for the script execution. Analogously, if a script has a DAEM tip associated to it, the Tip Jar will need to contain enough DAEM to make the script executable.