A T1 Line is a type of digital transmission line that can carry data at a speed of 1.544 megabits per second (Mbps). It is commonly used for connecting businesses to the internet or for private data networks. T1 lines are made up of 24 individual channels, each capable of transmitting 64 kilobits per second, allowing for multiple phone calls or data streams simultaneously. T1 lines are known for their reliability and consistent performance, making them a popular choice for organizations that require stable internet connections. They are often used in telecommunications and business networking to ensure efficient communication and data transfer.