Eli5: Why do all my cups and glasses have rims on the bottom that collect water in the dishwasher?

Question

Eli5: Why do all my cups and glasses have rims on the bottom that collect water in the dishwasher?

In: Other

Answer 1

IIRC some cups (pretty sure I saw this on IKEA ones) have a small gap in the rim on the bottom so water can run off