What is Ultimate Team FIFA 15?
Think you know what would make a winning team? Concept Squads is a powerful new squad planning tool that allows you to plan future squads using the entire FUT player catalogue. Use Concept Squads to plan your next Transfer Market buys, find replacements for players, and test out different Chemistry combinations.
The new Friendly Seasons mode lets you challenge your friends in a 1 v 1 version of the fan favourite Seasons format and track your stats. Win seasons to earn the current title holder position and the bragging rights that come with it!
Achieve greatness on the pitch with the legends of the past and the stars of today! Check out the new Legends who will join the 41 from last year on Xbox 360 and Xbox One. Get ready to play with football greats such as Roberto Carlos, Peter Schmeichel, Alan Shearer, and Bobby Moore. This is your chance to build that squad you’ve always dreamed of!
PHY, which stands for “Physical”, is the new sixth base attribute in FIFA 15 that will be featured on FUT player items. It is a measure of key physical traits such as Strength, Stamina, and Jumping. PHY is important to and FUT because it will help you determine a player’s ability to win physical battles across the pitch and keep their fitness throughout.
Although Heading was a great attribute to judge players by, PHY will have a more significant impact during a match. By paying attention to the players’ PHY attribute you’ll be better prepared to build your dream team in FUT 15 and beyond.
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What is FIFA 12 Ultimate Team? | Yahoo Answers
I've written a page on my FIFA website which explains it. Basically buy and sell players to create a team to play against others.