Digital or print materials that accompany a primary advertising campaign. Before the internet, “collateral” was practically synonymous with “brochures” that supported traditional TV commercials, such as a savings account brochure from your local bank branch. Today, “collateral” can refer to any printed or digital piece that supports and extends a campaign. Common digital collateral includes websites, landing pages, and banner ads.

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.