Imagine you want to get rid of a giant tree.
It's a tree that has grown too tall and too tangled with others in the garden, so much that it's become troublesome. The tree doesn't even bear any fruit, so it's practically useless for you. In addition to blocking the light from reaching the younger vegetation, and consuming too much nutrition from the soil to the extent of harming the surroundings, it's also starting to rot. The tree trunk has become a nest for vicious bugs, which will soon start harming the whole garden.
So you have to take that tree down to save the rest of the garden.
