## Manage local files
Optimizely <<product-name>> lets you upload images and files directly to the web server the <<product-name>> is hosted on, allowing you to host that content. This lets you have your content all in one place, and is usable out of the box within <<product-name>>.
## Manage files on a CDN
A content delivery network (CDN) is a large system of servers across the internet with the intention of providing end users with web content. This content can be in any form, including but not limited to text, downloadable objects, applications, or live streaming media.
Companies often use a CDN (such as Amazon Web Services or Microsoft Azure) because of better performance and availability. Another advantage associated with using a CDN is the cost savings that can come from offloading a significant portion of traffic from servers and network infrastructure of a company's own network resources.
As you can see, multiple people in multiple places are each able to access the content for your website without accessing the same server.