Personalization fields provide you with the opportunity to fill in important data about your opportunities, such as the title of a recent blog post, name of a blog, etc. Along with your pitch, these fields help to create a more personable approach to your outreach email. You are able to create and add new personalization fields when you are creating your templates and you can also access them under Campaign Settings > Personalization Fields.
Utilizing Personalization Fields in your campaign and email templates will allow you to save ample amounts of time. Including personalization fields in your email template will allow you to easily send out highly customized outreach emails, without you having to add little tidbits of information every single time you want to send out an email. Thanks to personalization fields, that data is auto-filled in your template.