A important part of any search engine optimization project is initial SEO keyword research to determine how well your site currently is performing and whether the site targets the keywords that site visitors are most likely to use.
Without the right keywords, your site is losing out on a significant amount of potential traffic and leads.

Keywords are the building blocks of SEO.

Identifying and selecting the appropriate keywords for your site is the very first step towards any SEO process.

Check what your target visitors are searching for. 
If they can find your site using those keywords, search terms - then you have gained a potential lead/sales.
So find out what terms people search for, how often, and how many and which other sites appear for those terms and then target those keywords and optimize your site accordingly.

Prepare a list of about 10-20 keywords relevant to your website.
Choose the keywords with strong relevance to your site (contents of your website and with relatively high search volume (popular search terms).

Focus on the keywords, which describe the purpose of your website.
You can then manipulate those keywords with the terms people are actually looking for.
There is no point wasting your SEO efforts on highly popular and competitive keywords, as you will be competing with millions of other sites. And your site will have less chance of getting the desired ranking.

Once you decide your keywords, you can then start optimizing your website accordingly.

When you do not know all the important keywords that visitors use to find your company's products or services, you can try free online tools like 

- Google's Adwords Keyword Tool - provides a long list of related terms and indicates search volume based on a five-point ranking. 
- Yahoo's Keyword Selection Tool - provides actual keyword volume for the most recent month it has data both for the term you type in and for related terms.