API

The percentage of recipients who unsubscribe from an email after it is sent. In large-scale marketing, some unsubscribes are expected, but it’s a metric that can be monitored to ensure you aren’t putting off your audience with either the frequency or messaging of your email advertising.

A structured file that catalogs and organizes a website, for easy, readable access by search engines.

A sitemap should be submitted to major search engines when you create a site, and also any time you have large-scale restructuring of the site. New sitemaps do not need to be generated every time a new page goes live. These will usually be crawled by search engines and added to the number of indexed pages on a site.

Metadata is data that applies to other data. This can seem confusing to some, so for an example, you may take a picture and save it digitally on your computer. That image’s metadata could include information such as when and where the picture was taken. In this way, the file contains both the image itself and additional descriptive data. Other metadata can include creator information and licensing or legal rights related to a file’s use.