Google is the world’s largest search engine & one of the best mediums to get your content found by in the world.
In addition to this, they also own YouTube, which is the world’s second largest search engine.
How Google Search Engine Works
Google crawls the web by following links from URL to URL & indexes the content that bots are allowed to index.
This means, they will parse the content, establish what it is about based on the tagging & content written in the page, and assign it to keywords that are either contained on the page or are semantically related to those that are.
Index entries are sorted on a number of factors including quality of content & site structure, number of & quality of backlinks that are pointing to the page from other sites, as well as some user-experience oriented metrics in order to rank them.
This is a short way to describe how the search results are devised that answer your queries on the Search Engine Results Pages.
These rankings are constantly changing, as sites are ever evolving & the algorithms used for rankings change, making it important to keep a close eye on your website SEO health & strategy at all times.