A clickthrough is generated when a user clicks with their mouse on an advertiser's message in order to move to the advertiser's web site. A clickthrough is often stated as a percentage of page impressions clickthrough rate (CTR);

Number of "clicks" on a specific object, e.g. an online advertising area. AdClick is also known as Click Through. Both expressions describe the mouse click on a linked advertising banner of a web page that moves the user directly to the page of the advertiser.