This is a type of data storage that retains your data's values without power. When you remove the batteries
or if the power goes out, nonvolatile memory will retain it's memory.
Examples of nonvolatile storage includes
Usually the term is only used in the context of temporary short-term data storage, especially for RAM, since RAM can be either nonvolatile or volatile, while the other items listed above tend to always be nonvolatile and so are always assumed to be so.
In a context not related to computers, a nonvolatile substance is one that doesn't easily evaporate.