Segmentation involves only targeting certain users with a marketing campaign. The reason why segmentation is used is because the messaging is more personalised, and therefore, is more likely to be successful in its aims.

It is possible to segment users based on any number of factors. This ranges from their job titles to their position with the sales funnel, along with any other personal attributes that may matter for the campaign.

Segmentation is also the opposite of 'send-to-all' email blasts.