Praline is a form of confection containing at a minimum culinary nuts and sugar; cream is a common third ingredient.

There are three main types:

Belgian pralines, which consist of a chocolate shell with a softer, sometimes liquid, filling, traditionally made of different combinations of hazelnut, almonds, sugar, syrup, and often milk-based pastes. These high-fat, low-melting point chocolates are at the luxury end of Belgian chocolate and represent an important product of many Belgian chocolatiers.

French pralines, a firm combination of almonds and caramelized sugar.

American pralines, a softer, creamier combination of syrup and pecans, hazelnuts or almonds with milk or cream, resembling fudge.

More Info: en.wikipedia.org