You might work hard to optimize your ad campaigns, but if you’re not careful about preventing advertising fraud then you’ll find that you could be losing more money than you’re making. In fact, reports show that losses from digital ad fraud are exceeding 42 billion a year.

In order to protect your precious investment into digital marketing strategies, you’ll need to ensure you’re taking the necessary precautions against online advertising fraud. Here’s what to know about it and how to stop it from happening to you.