WHAT IS DRIP MARKETING?
A Drip Campaign is an automated set of emails that are released based on specific timelines or user actions. They allow you to stay in touch with groups of people based on events like when a user signs up for an account or how often that user visits your site. Each time a drip email is sent out, it comes from a suite of existing emails – there’s no need to manually write and send each one. They can even be personalized with your contacts’ name, company info, and more.
The beauty of drip emails is that it happens automatically based on triggers and customer habits that you define.
Information Source: https://zapier.com/learn/email-marketing/drip-marketing-campaign/