Just like we all need a tool to search our own things, every company also needs a search engine to build so that internal and external entities can find what they want.
For example, an employee has to search for his/her PTO balance, paystub of a particular month, and so on. The HR department may search for employees who are in finance group or so. In an e-commerce company, a product catalog is the most searchable object. It is a very sensitive object because it directly impacts the revenue of the company. If a customer wants to buy a pair of shoes, the first thing he/she can do is search the company product catalog. If the search time is more than a few seconds, the customer may lose interest in the product. It may also be possible that the same customer goes to another website to buy a pair of shoes, resulting in a loss of revenue.
It...