For the following text show the most common keywords, including keyword density.
Here's the text: Marketing is an essential aspect of any successful business. It involves promoting and selling products or services to customers, using various techniques such as advertising, branding, and market research. A good marketing strategy can help a business reach its target audience, increase sales, and build a loyal customer base.
In today's digital age, online marketing has become increasingly important. Social media platforms like Facebook, Twitter, and Instagram provide businesses with a way to connect with customers in real-time and promote their products or services to a wider audience. Other popular digital marketing techniques include search engine optimization (SEO), email marketing, and content marketing.