For My Retirement:

When you’re too old to work, and so you don’t have to rely on handouts from family or the state.
For Large Future Expenses:

For example, your children’s tertiary education; or a deposit on a house; or to start up a business; or to study further; or to travel, etc.
For Emergencies And Unexpected Expenses:

If you don’t have enough money saved, an unexpected emergency could prove financially disastrous.