Search Engine Optimization is a Technique to Optimize your Website for Search Engines. Every Search Engine will Check Title, Description and keywords. If your Content is well Optimized with Keywords and Your Title and Description is also well Optimized, You will get Top Traffic rank within 1 month.
Because no search engines crawl a website daily.
For example google is crawling every website within 3-4 weeks. so if Today you Optimized your Website, then it will effect only after next crawl. Every search engines are indexing a website on their server and update it within 3-8 weeks based on the search engines.

Search engine Optimization ( SEO ) is not an easy Process. Not only you have to write well title, description and keyword. Also you have to know which keyword is more Effective. You have to research for keywords. Your Content should have those keywords. Their are some limitation also. You have to describe your website and title within limited character.
Even you can’t Cross the keyword limitation. Your Keyword Density Should not Be so high. Otherwise Search engines will skip your Keyword section. Also Sometime the keyword section of a web page has fallen out of favour due to abuse by some website owners.
You have to do more for optimizing a website and you should have experience to optime a website. Their are veriour tools available for keyword research or seo but you can’t get your expected rank with these tools unless you have some experience. To have an experiance you should Spend 1 year for SEO. Because searc engines are crawling a website after every 1 or 2 month. So 1 month is minimum to get an experience for seo.

Also you have to update your website regularly. Otherwise your website will not get much traffic rank. So better go for a SEO company. They will optimze your website and also update your content according to search engines. But they will take 10,000 – 20,000 Rupees for Search engine optimization.