What can Zakat donations be spent on?

What can Zakat donations be spent on?

The impoverished: 

Poor

Poverty-stricken

Penniless

Destitute

Needy

Bankrupt

The disadvantaged and Needy:

Deprived

Underprivileged

Destitute 

Charities:

An organisation set up to provide help and raise money for those in need.

Reverts and friends of the Muslim community:
The indebted.
Stranded travellers.
Supporting causes on behalf of Allah (SWT).