What is indexing by the search engine ?

Search engine indexing means how data is collected, parsed, and stored to facilitate fast and accurate retrieval.

Popular engines focus on the full-text indexing of online documents , or other searchable media types such as video, audio and graphics. Meta earch engines use the indices of other services and do not store a local index. Larger services typically perform indexing at a predetermined interval due to the required time and processing costs, where as agent-based search engines index in real time.