Cucumbers are a very good source of the vitamins C and the mineral molybdenum. They are also a good source of vitamin A, potassium, manganese, folate, dietary fiber and magnesium and contain the important mineral silica.

The fruit is roughly cylindrical, elongated, with tapered ends, and may be as large as 60 cm long and 10 cm in diameter. Cucumbers grown to be eaten fresh (called slicers) and those intended for pickling (called picklers) are similar.

Cucumbers can be pickled for flavor and longer shelf life. As compared to eating cucumbers, pickling cucumbers tend to be shorter, thicker, less regularly-shaped, and have bumpy skin with tiny white- or black-dotted spines. Color can vary from creamy yellow to pale or dark green. The pickling process removes or degrades much of the nutrient content, especially that of vitamin C.  Pickled cucumbers are often referred to simply as "pickles".