A preheader is a short snippet of text displayed alongside the subject line in an email preview. It acts as an introduction, giving readers a brief idea of the email’s content and purpose, often encouraging them to open it.
A well-written preheader supports the subject line by providing clarity or adding intrigue. It can highlight an offer, answer a question, or summarize the email’s message. Its role is subtle yet impactful in boosting engagement by making emails more appealing at first glance.