Okay, little buddy! An excavator is a big machine that helps us dig in the ground. Imagine it like a giant robot with a big arm!
At the end of the arm, there is something called a 'bucket.' You know how a bucket can hold water or sand at the beach? An excavator's bucket is like that, but much bigger!
The bucket can scoop up dirt and rocks. Just like when you use a shovel to dig in the sand, the bucket helps to lift and move things around. So when we say, 'The excavator has a bucket to dig,' it means the excavator uses its bucket to pick up lots of dirt and help build things like roads or houses.
Isn't that cool?