SEO is called as Search Engine Optimization. In Todays World Whenever you have any requirements, first people try to search on google
These people are called as hot leads for a business. Generally approx 90% people search for results on 1st page and just 10% look for second page.
For a Service Provided or Business Entity it is highly important to drive these inquiries on to their website
However if your website is not optimized for search engine you will loose these inquiries which is absolutely FREE of marketing cost for a company
Hence SEO or Search engine optimization comes into picture where companies invest crores of rupees to come onto first page of google.
for example we are on first page of Google for almost all IT and non IT courses that we conduct.
In short words it is need of today's business