What is full of holes but still holds water?

A sponge is a common example of something that is full of holes but still holds water. The numerous tiny holes in the sponge allow it to absorb and retain water, even though it may appear to be mostly empty space.

Sponges are made of a porous material that is able to soak up and retain liquid through capillary action. The water is held within the structure of the sponge, filling up the empty spaces between the holes.

This unique ability of sponges to hold water despite being full of holes makes them a popular choice for cleaning and wiping up spills. Sponges can be easily rinsed out and reused, allowing them to effectively absorb and hold water multiple times before needing to be replaced.