When a website sends traffic to another website. Tracking referrals can help you understand how people find your website without using a search engine. For example, if you put links to your website in your social media posts on Facebook and Twitter, these sites would be listed as a source of referral traffic. Referrals can also come from websites that posts news articles, reviews, and other industry-relevant content.

Combining Email Marketing with Other Types of Marketing
Whether you choose to do your marketing online or offline, one thing does not change. This is the concept that no single marketing strategy will be as effective as a combination of two or more marketing strategies.