A video encoder is a device or software that converts raw video files into a compressed format suitable for storage or transmission. This process reduces the file size while maintaining acceptable quality, making it easier to share videos online or store them on devices. Common video formats include H.264, HEVC, and VP9. Video encoders are essential in various applications, such as streaming services like YouTube and Netflix, where large amounts of video data need to be efficiently delivered to viewers. They help ensure that videos load quickly and play smoothly across different devices, including smartphones, tablets, and computers.