What do you understand by Keyword streaming?

Keyword Streaming means analyzing and selecting the best keyword and targeting to your website. One reduces each word to its stem. For instance, "investigating", "investigates", "investigated" all become just the root word or stem "investigate" in a search index. This is used for search functionality which means enabling any form of the search term to find all variations of the supplied keyword. It thus improves the search experience.

Keyword Streaming is a practice to find out the root word from the search query.

For example, A keyword like "helpful" will be split to the word "help" by stemming algorithm that turns it possible. Thus, the search result appears on the screen will contain the word "help" in it.