Sort By Functionality (Cs-Cart Version 4.3.1)

General General Questions
1

We need to add Sort by functionality in product listing page and search result page in cs-cart version 4.3.1.

It will be helpful if you guide us.

2

We need to add Sort by functionality in product listing page and search result page in cs-cart version 4.3.1.

It will be helpful if you guide us.

what is "functionality"?