SEO is the acronym for Search Engine Optimization which simply means to increase the visibility of your website with search engines such Google, Yahoo and Bing by non paying methods.
This entails appearing on top of search results when a user is looking for a particular topic or subject.
SEO strategies analyze how search engines work and what terms people are looking for in order to optimize websites for increased presence online.
The higher your website appears on search engines, the more visitors will visit your website, discover your company/brands/products/services.
Bottom Line: The higher is your internet online presence, the more chance you have to make a potential sale or business transaction.