Questions About Prohibition

What is Prohibition?
To prohibit something is to ban it or forbid it.  Prohibition is a policy supported by law that prohibits a particular item.  Prohibition is most closely associated with alcohol, as the prohibition of alcohol has been a widely discussed issue throughout history.  To have prohibition on alcohol is to ban the sale, manufacturing, exportation and trafficking of alcohol, or any combination of these things based on the government policy.
When was there Prohibition?
The idea of prohibition has been around as long as there has been alcohol, but the actual enforcement of prohibition was most popular in the 20th century.  Despite this, some countries still have prohibition, as well as some small counties and towns throughout North America.
Where was there Prohibition?
Countries with the most notable prohibition eras include the US, Finland and Canada.  Countries where prohibition still exists include countries in the Middle East and Northern Africa.