What is the difference between the different .com, .net, .org, .biz, .mobi, .tv, .es and .eu extensions?

The initial objective with which these extensions were created was the following:

• .com for commercial purposes
• .net for network infrastructures
• .org for organisations
• .biz for businesses
• .mobi for mobile telephony
• .eu for the European Union
• .tv for television channels