Undergraduate degrees, also known as Bachelor or first degrees, can be 3 years (or 4 years with a Foundation year). There are also some 4 year degrees that include a postgraduate award such as an MSc (quite common for subjects like engineering).
After a first degree, it is possible next to do a Master's degree, normally 1 or 2 years long.   Beyond an MA/MSc there is research and perhaps a PhD degree.