www.greatchartatwar.org.uk Campaign Medals of WWI
World War 1

I don't intend to copy other people's work so here is a good link
I've found on the WW1 Campaign Medals.
http://www.greatwar.co.uk/medals/ww1-campaign-medals.htm
The 1914-15 Star

 

 

 

There was also a much rarer 1914 Star.
This is identical to the 1914-15 Star except that it has just 1914
across the middle of the medal rather than 1914-15.
The British War Medal
The Victory Medal

 
These three medals together were affectionately known as
"Pip, Squeak, and Wilfred" (a dog, penguin and rabbit) after a well known cartoon that appeared in the Daily Mirror.

 

The British War Medal and the Victory Medal together, were known as "Mutton and Jeff"
   
World War 2
The Defence Medal
The General Service Medal