Search Engine Optimization is the process of improving the quality and quantity of a website traffic through a webpage or a website from search engine. It targets unpaid traffic(natural or organic results)rather than direct or paid traffic.
There are two kinds of SEOs are:
On-page SEO (On-site)
Off-page SEO (Off-site)
On-page SEO refers to any optimization that you control and include on your website. With on-page optimizations, you aim to make your website more usable and valuable to users to improve your rankings or visibility in search results on Google, Bing, and other search engines. On-page SEO leads to higher search rankings, increased traffic to your site, and more conversions.
Off page SEO is the process of making high quality backlinks for the website. It is a long term process focused on backlinks to your webpages from social media , authority site and a social bookmarking.