What is the role of radula in molluscs?

Explanation

The radula is a special rasping structure found in many molluscs. It is used to scrape and acratch the food and to create depressions in rocks which molluscs use as their habital.
The radula bears bears many roes of tiny teeth that are replaced as they wear down. e.g., Limplet is a marine invertebrate that uses its radula for creating home by boring a shallow hole in the rock.