Singapore has the CPF (Central Provident Fund), a savings scheme whereby the
worker and the employer make compulsory monthly payments that will go into a
fund set up principally for retirement. The CPF is essentially savings system
where the worker contributes a certain percentage of their salary (20 % until
the age of 55, 12.5% from 55-65, and then 7.5% thereafter), and the employer
also making a contribution (10% until you're 55, 4% from 55-60, then 2% until
you retire). You can withdraw certain amounts from this fund for certain reasons
only (e.g. medical emergencies, buying a home & investing in stock), but
its main purpose is to ensure that everyone has an adequate sum on which to
retire.
Foreign nationals are not required to contribute to the CPF. However, if
you are a foreign professional on a contract of 3 years or less, you will have
to ensure that you and/or your company are paying into your usual pension fund
in your home country.