Search is such an important part of a website especially when there is a large amount of content. It helps improve engagement, or dwell-time as it’s sometimes known. Most of all it makes the site user-friendly as it helps visitors find what they’re looking for.
The 'Search' and 'Smart Search' components have coexisted since Joomla 2.5.
com_search) would provide a straightforward search feature while Smart Search would offer indexing and more advanced search capabilities with filtering.