# Overlay ads For live-streaming workflows where you want to increase monetization without interrupting the viewing experience with mid-roll ads, you can leverage your current AWS Elemental MediaTailor integration to guide an advertising format that is rendered client-side. This type of advertising is known as *overlay ads*. Overlay ads are non-linear video ads that appear in the form of 'L-band ads,' 'non-linear video ads,' 'picture-in-picture ads,' 'motion overlays', 'in-content advertising', or 'frame ads.' MediaTailor detects a SCTE-35 marker with segmentation type `id=0x38` as an in-band signal for an overlay ad-insertion opportunity. The SCTE-35 marker causes MediaTailor to send a request to the Ad Decision Server (ADS), which then responds with a non-linear ad payload in the VAST response. MediaTailor parses the VAST response in order to support overlay ad insertion. MediaTailor does not perform any stitching of linear ads, but rather signals to the player that there's a non-linear overlay ad available to play. This signaling allows the player to fetch and correlate the non-linear ads to play from the client-side tracking endpoint. The player then handles the display, reporting, and other tasks related to those ads. For example, the player's developer can use a device SDK from a vendor that supports overlay-ad formats. For more information about client-side tracking integrations, see [Client-side ad-tracking integrations](ad-reporting-client-side-ad-tracking-integrations.md). ![The image depicts a timeline of various ad types displayed alongside a content video. Linear ads play before and after the content video. The ad before the content video is called a pre-roll ad. The ad after the content video is called a post-roll ad. A non-linear ad overlaps a portion of the content video itself. The non-linear ad is called an overlay ad.](http://docs.aws.amazon.com/mediatailor/latest/ug/images/client-side-overlays.png) **Topics** + [Prerequisites for using overlay ads with MediaTailor](overlay-ads-prerequisites.md) + [Getting started using overlay ads with MediaTailor](overlay-ads-getting-started.md) + [Logging and metrics for overlay ads in MediaTailor](overlay-ads-logging-and-metrics.md) + [Billing for overlay ads in MediaTailor](overlay-ads-billing.md)