AV to HDMI converters are devices that allow you to connect older audio/video equipment, such as VCRs or DVD players, to newer HDMI-enabled displays, such as HDTVs or projectors. These converters typically have AV inputs (such as composite or component) on one end and an HDMI output on the other end, allowing you to convert the analog AV signal to a digital HDMI signal for better compatibility with modern devices. They are useful for situations where you want to connect older equipment to newer displays that only have HDMI inputs.