A seal for sealing a sealing surface 2 between a first machine part 1 having a seal accommodating structure, preferably a groove, and a second machine part 3, which defines the sealing surface 2 and can be moved relative to the first machine part 1. The seal seals a high-pressure area between the machine parts 1, 3 from a low-pressure area and has a retaining element 5 for positionally fixing the seal in the seal accommodating structure, and a sealing lip 6 which is formed on the retaining element 5 and is made from an elastomeric material having a sealing edge 7 formed at a free end of the sealing lip 6 for abutment on the sealing surface 2. The sealing lip 6 has a high-pressure surface area 10 bordering the high-pressure area, and a low-pressure surface area 11 bordering the low-pressure area. The seal has a supporting element 15, wherein the supporting element 15 forms a support of the sealing lip 6 on the low-pressure surface side, the support extending substantially parallel to the sealing edge 7, with the support being arranged between the sealing edge 7 and the retaining element 5.