Dynamite is an item that can be bought at Steve's General Store at a price of $25,000 per 20 dynamite. It can be used to destroy Bedrock, but cannot destroy any other blocks. However, its ability to destroy bedrock makes it useful. It is still not recommended to buy large quantities of it unless you have nothing else to spend your money on.
It has a low chance to turn into a blue Dynamite when you use it, that does two times more the normal damage radius, and if you happen to be caught in the explosion, you will be awarded with the badge: Blast!
It has a normal TNT mesh on normal, but in Halloween its a pumpkin mesh.
It has a present mesh in December, as part of the Christmas update.