Google My Business is Google's online business directory, one of the most important directories to be registered at, because it helps increase your online visibility as well as your website's SEO.
Once you create a Google My Business account, you automatically appear on Google Maps.
This works in addition to your existing website, giving your business both a public identity and presence within the frame of all Google products. After registration, your business info appear on Google Search, and you can view search statistics for your page on Google My Business.
Another important part of having a Google My Business account is that customers get the option to rate you with reviews which helps other searchers to opt in choosing you more easily.
Remember, lots of positive reviews = lots of sales.