Blue Ethernet cables are a common type of Ethernet cable with blue-coloured outer insulation or jacket. The colour of the cable jacket is primarily for visual identification and organisation in network installations, making it easy to distinguish between different cables.

These blue Ethernet cables can come in various categories, such as Cat 5e, Cat 6, Cat 6a, or Cat 7, with each category designed for different data transmission speeds and performance characteristics. The choice of the specific category depends on your network requirements and the speed of data transmission you need for your devices.

Ethernet cables, regardless of their colour, are widely used for wired network connections in homes, offices, and data centres. The colour coding helps network administrators and users quickly identify and manage cables in complex network setups.