Click through rate (CTR) may be defined as a technique used to measure effectiveness of an online advertising campaign which may include posting link to a website or an email marketing campaign. It basically measures how many clicks a specific advertising link has. The number of clicks is important for the company in order to know how its online marketing campaign is going.
To improve your click through rate then by using the webmaster tool make some research has the user which keywords is mostly searching so if your brink your website top in the search engine for the particular keywords then you can easily improve your ctr