This blog will explain how to create Multi Select Look Up Component in LWC. This LWC component will work for below use cases.
1. When you have to build use case where user can select multiple values by searching in input field.(Multi look up).
2. When you have to build a use case where you have to select single value by searching (Single Select Look Up)
3. When you have to use a look up functionality by using extra filter criteria.