A binding binds a name or even several names with a function definition.

In Haskell, a binding is defined by symbol “=” whereas

1. on the left hand side
   1. the function name and its parameters
   2. or a pattern is given,
2. and on the right had side the definition of the function.

half x = x / 2

…works in…

module Main where
 
main :: IO ()
main = 
        do
                print $ half 5
 
half x = x / 2

(x1, x2, x3) = (42, "Hello", "World")

…works in…

module Main where
 
main :: IO ()
main = 
        do
                print x1
                print x2
                print x3
 
(x1, x2, x3) = (42, "Hello", "World")

Person name number = Person "Lutz" 1243

…works in…

module Main where
 
main :: IO ()
main = 
        do
                print name
                print number
 
data Person = Person { sName :: String, iNumber :: Integer }
 
Person name number = Person "Lutz" 1243

(x1, Person x2 x3, x4) = ("...", Person "Lutz" 1243, '#')

…works in…

module Main where
 
main :: IO ()
main = 
        do
                print x1
                print x2
                print x3
                print x4
 
data Person = Person { sName :: String, iNumber :: Integer }
 
(x1, Person x2 x3, x4) = ("...", Person "Lutz" 1243, '#')