Lines of latitude are also referred to as **parallels**. This term is used because lines of latitude run parallel to the equator and to each other. They are imaginary lines that circle the Earth horizontally, measuring the distance north or south of the equator. The equator is the starting point at 0 degrees latitude, and as you move towards the poles, the latitude increases.
Unlike lines of longitude, which converge at the poles, lines of latitude remain equidistant from each other. This parallel nature is why they are called parallels. So, the correct answer to the question is **parallel**.
