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Code 128 is a high-density barcode used for encoding alphanumeric characters, including letters, numbers, and special symbols. It is widely used in packaging and shipping to track products efficiently because it can represent a large amount of information in a compact format. The barcode consists of varying width bars and spaces that can be scanned by barcode readers. Each character is represented by a unique pattern, allowing quick and accurate data capture. The design makes it suitable for environments that require reliable scanning and high-volume data processing, such as warehouses and retail.

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    Code 39 is a type of barcode that uses specific characters to represent data. It can encode numbers, letters, and some special characters, making it versatile for various applications. Each character is made up of a series of dark and light bars of varying widths, which can be scanned by a barcode scanner. Code 39 is commonly used in inventory management, shipping, and label printing. Its simplicity and ability to support alphanumeric data make it popular, though it has limitations in data density compared to more complex barcodes.