Email marketing encompasses various types that cater to different objectives, including nurturing leads, generating sales, and providing customer value. The four main categories are informational, drip, transactional, and promotional emails. Informational emails aim to educate and inform subscribers, while drip campaigns automate sequences of emails sent on a schedule. Transactional emails respond to specific actions taken by customers, such as purchases or subscriptions, and promotional emails directly promote products or services. By understanding the different types of email marketing and their purposes, businesses can create effective strategies that engage their audience and drive results.