Variable Bit Rate (VBR) is a concept in telecommunications and computing that refers to the method of encoding audio or video data where the bitrate can change dynamically. Unlike Constant Bit Rate (CBR), where the bitrate remains fixed throughout the entire media file, VBR adjusts the amount of data used per second based on the complexity of the audio or video content at any given moment. This means that more data is allocated to complex segments that require higher quality, while less data is used for simpler segments, resulting in more efficient storage and potentially higher overall quality. VBR is commonly used in formats like MP3, AAC, and certain video codecs, allowing for a balance between file size and quality. This approach is particularly beneficial for streaming services and media storage, as it optimizes bandwidth usage and storage space without compromising the user experience.