If you haven’t as yet tried out Overwatch, you can try it for free starting at 19:00 GMT on Friday 16 February until 8:00 GMT on Tuesday 20 February.
The free weekend is available on PlayStation 4, Xbox One and PC. (A PlayStation or Xbox subscription is required to play Overwatch on these platforms.)
During the free weekend, all 26 heroes and 17 maps are available to play on over a variety of modes. Those who decide to purchase Overwatch after test driving the game will keep any progress made during the weekend as long as they use the same Blizzard, Sony Entertainment or Xbox Live account they played on.
Source: God is Geek