European cup is European football championship played amongst the national football teams. It is also organised by UEFA(Union of European Football Associations). It is being held every four years in between the football world cup but the same year as Olympics (both of which are also held every four years).

Euro 2012 is being hosted by Poland and Ukraine. 51 nations contested to qualify for Euro 2012 to join the two host nations in the tournament. But only 16 nations for the final tournament can qualify. The winner of the tournament gains automatic entry to the 2013 FIFA Confederations Cup hosted by Brazil.

16 european nations participating amongst four different groups are:
Group A : Russia, Czech Republic, Poland, Greece
Group B : Germany, Denmark, Netherlands, Portugal
Group C : Croatia Spain Italy Ireland
Group D : Ukraine England France Sweden

Don’t get confused.

UEFA Champions League is a tournament played every year between the european football clubs,whereas UEFA Euro 2012 is a football tournament for european national football teams, played every four years.