Short-term and long-term savings are two different methods of saving for two different kinds of goals.
Short-term savings usually has a 3 to 6 month necessity. This is usually for a planned medical issue, vehicle need, vacation, or other larger expense.
Long-term savings can be thought of as retirement-level. You want to save and save and save for years, and have enough saved for your cash needs later in life.
Having short-term and long-term savings needs is not facilitated enough by having one savings account for everything. We recommend having a few accounts, each for something different for your needs. In this way, you never cross-spend or worry about overspending while saving.