What is the difference between continuous and discontinuous variation?

Discontinuous variation  refer to large, conspicuous differences from the parents
This is where individuals fall into a number of distinct  categories, and is based on features that cannot be measured across a complete range
continious variation refer to small, indistinct differences from the normal condition.
Milk yield in cows, for example, is determined not only by their genetic make-up but is also significantly affected by environmental factors such as pasture quality and diet, weather, and the comfort of their surroundings