Dark fibre, also known as unlit fibre, refers to unused or unlit fibre optic cable within a telecommunications network. It is a term used to describe fibre optic cable that is installed but not yet utilized. Dark fibre can be leased or purchased by businesses or organizations to create their own private network, reducing the risk of network congestion and improving data transfer speed. The term "unlit fibre" is often used interchangeably with dark fibre. Another synonym for dark fibre is "unused fibre," which highlights the fact that these strands of fibre optics are unutilized but can be used for different purposes. However, whether it is called dark fibre, unlit fibre, or unused fibre, it provides numerous advantages for businesses and organizations.