A driller is a person who helps to get oil out of the ground. To explain it very simply, oil is like a treasure hidden deep underground in a big container called a reservoir. The job of the driller is to make a hole in the ground so that they can get to the reservoir and bring the oil up to the surface.
To drill a well, the driller uses a big rig that looks like a tall tower with a long arm sticking out. At the end of the arm, there is a drill bit that can chew through rocks and dirt to make a big hole in the ground.
The process of drilling starts by putting the drill bit on the ground and spinning it around really fast. The spinning motion helps the drill bit grind through the ground until it reaches the oil reservoir. Once the drill bit hits the reservoir, the driller stops drilling and starts pumping special liquids into the hole to help bring the oil to the surface.
The oil is then collected in big tanks and transported to where it needs to go, like a refinery where it can be turned into things like gasoline for cars or jet fuel for planes.
It's a complex and dangerous job, so drillers have to undergo lots of training and wear special equipment to keep themselves safe. But their hard work helps bring one of the most important resources we have to the surface, so we can use it to power our daily lives.