The ratio of the amount of revenue generated by an ad campaign to its cost. If you generated $10,000 from a campaign that cost $1,000, your return on ad spend (ROAS) would be 10:1. While similar to return on investment (ROI), ROAS is more focused on the hard cost of a campaign rather than on the overall value of running a campaign, which could include brand awareness or other marketing objectives.

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.