In Uploadcare, "Traffic" refers to the amount of data transferred from Uploadcare’s servers toward your end-users, especially when you fetch files via Uploadcare’s Content Delivery Network (CDN). Every time an image, video, or any other file is retrieved and delivered to your users, that data transfer is counted as CDN traffic. Uploadcare offers image and video optimization tools, which are quite handy because they help you significantly reduce your traffic usage. By optimizing your files, you’re essentially reducing the file size without noticeably affecting the quality, meaning less data needs to be transferred, hence, less traffic used.