There are several different types of barcodes, each with its own unique format and use. 

Here are some of the most common types of barcodes:

1. UPC (Universal Product Code): UPC barcodes are used to identify products in retail stores. They consist of 12 digits and are typically found on product packaging.

   
   

2. EAN (European Article Numbering): EAN barcodes are similar to UPC barcodes but are used primarily in Europe. They consist of 13 digits and are also used to identify products in retail stores.

   
   

3. Code 39: Code 39 barcodes are a type of alphanumeric barcode that can encode letters, numbers, and some special characters. They are commonly used in logistics and inventory management.

   
   

4. Code 128: Code 128 barcodes are a high-density barcode that can encode large amounts of data. They are commonly used in shipping and logistics applications.

   
   

5. QR (Quick Response) code: QR codes are a type of 2D barcode that can store much more data than traditional barcodes. They are commonly used in marketing and advertising to link to websites and other digital content.

   
   

6. Data Matrix: Data Matrix barcodes are another type of 2D barcode that can store large amounts of data. They are commonly used in manufacturing and logistics applications.

   
   

Overall, the type of barcode used will depend on the specific application and the amount of data that needs to be encoded.