Search engine optimization (SEO) is the practice of increasing the quantity and quality of traffic to your website through organic search engine results.
(Organic search engine result---- the result we get when we type a query (keyword) in google or any other search engine)
To understand what SEO really means, let's break that sentence down and look at the parts:
No. of keywords : 10
First Ranking Keywords : 1
Keywords in top ten : 10
No. of keywords : 10
First Ranking Keywords : 10
Keywords in top ten : 10
No. of keywords :18
First Ranking Keywords : 12
Keywords in top ten : 18
No. of keywords : 18
First Ranking Keywords : 2
Keywords in top ten : 17