Saving is the process of putting cold, hard cash aside and parking it in extremely safe, and liquid which is usually for short-term goals which you want to achieve in five years or less. This can include saving for special items or occasions such as birthday, wedding or some other gadgets you want to buy. Its also useful to have savings which you can get a quickly in the event of an emergency or if you need access to your money at a set time. Investing is only for medium-term or long-term and prepared to take some risk with your money. Therefore, both can use for the future that can help us to achieve our financial goals. It is depending on how long you want to save for and may include attitude to risk.
Extremely safe and liquid are typically mutually exclusive
When talking about safe assets, people usually think about physical gold, but the latter is far from being liquid (cash money being most liquid). With gold, you would need time to sell it at its true price which is not what the idea of liquid is all about. Indeed, you can claim that you would pawn your gold in case of emergency, but this doesn't live quite well with the notion of "extremely safe" since you would get only half the price for it which is a far cry from being safe (safe meaning not losing value over time, obviously)