In e-commerce, a search engine is used to bring to the potential customer the product or service they are looking for. In training, search engines help staff to locate documentaion about a product or workflow quickly.
Search Engine is the software that allows the end user to locate the piece of information, they need when they need.
Allows your staff to locate and reach that single piece of information in a timely manner. When you have a lot of digital assets you are in need to provide your employees with training material, then building a smart search engine is a wise investment.