SEO is an acronym for search engine optimization.In the real estate industry optimization efforts focus largely on winning at local SEO. Local SEO strategies rely on area-specific content and pages to increase geographic relevance.
Most people believe in conducting a research before arriving to a conclusive decision. So they jump into google, and type in  the key words. If your real estate business is among the first results, then you are a leap ahead of the crowd, You are likely to get the leads.
SEO help dominate the search results and the market, hence the sales.