Keywords are the words and phrases that your customers use to search for your products, services, or solutions online. Keywords are essential for your SEO, as they help you optimize your content, website, and ads for the search engines and the users. However, using irrelevant or low-quality keywords can harm your brand awareness and SEO, as they can lower your relevance, quality score, and ranking. You should use relevant, high-quality, and long-tail keywords that match your customers' intent, needs, and expectations.