Preheader text, also known as preview text, is a short line of text that appears next to or below the subject line of an email in most email clients. It is usually the first line of text in an email and provides a preview of the content that recipients can expect to see if they open the email.
The purpose of preheader text is to give recipients a glimpse of the email's content and entice them to open it. It is an important element of email marketing because it can increase the open rate and engagement of an email campaign. When crafting preheader text, it's important to keep it short and concise, as most email clients truncate it after a certain number of characters. It's also important to make the text engaging and relevant to the email's content.