Absolutely. SEO is a form of marketing. But unlike other forms of marketing, SEO is aimed at those who actually need your product or service. Your website shows up to people looking for associated keywords, so they’re more likely to connect with you and become customers.
While you can also learn SEO yourself, it’s worth noting that it may take years to understand how it fully works. It takes a long time to get the experience you need to understand what kind of strategies to apply for your website to become a hit. Therefore, leave it to a professional instead.