"image/png;base64?" what does it do? : <p>I have a question about this piece of code:</p>

<p><code>redirectUrl</code>: <code>"data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAACklEQVR4nGMAAQAABQABDQottAAAAABJRU5ErkJggg=="</code></p>

<p>When I include this piece of code, all pictures on a website dont get loaded. But what does this encoder do? </p>

<p>Does it block pictures, hides them or just isn't loading them?</p>
