Nailed it. When Excel users press tab, they mean "go to the next cell." Conveniently, this is also what the format means to the computer when it encounters the

Nailed it. When Excel users press tab, they mean "go to the next cell." Conveniently, this is also what the format means to the computer when it encounters the tab separator. It's not foolproof, but it's much better. The human interpretation of the character matches the machine interpretation.