Indexing is the process of entering information from historical records into an online, searchable database. Google bots continously crawl the web to lst all the new websites.
The indexed file is a simple file made up of unique keys and data elements that are accessed by special database computer programs. Internet search engines use special indexing techniques that store Meta data about web sites and content.
In general, indexing refers to the organization of data according to a specific schema or plan. In IT, the term has various similar uses including, among other things, making information more presentable and accessible.
In layman's terms, indexing is the process of adding web pages into Google search. Depending upon which meta tag you used (index or NO-index), Google will crawl and index your pages. A no-index tag means that that page will not be added to the web search's index.
Indexing basically means enabling Google to show your website in it's search results. Not a good look to index domain.webflow.io if your main domain.com is live because most often it appears in search results before your actual domain.
Indexing is the process of creating indexes for record collections. Having indexes allows researchers to more quickly find records for specific individuals; without them, researchers might have to look through hundreds or thousands of records to locate an individual record.