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I have difficulties describing it, but here's an example from what I know (and might be totally wrong):

function greet(name, salutation) { return 'Hello ' + salutation + ' ' + name }
greet('Foo', 'Mr') // => 'Hello Mr Foo'

// higher order function
function greetMr (name) { return greet(name, 'Mr') }
greetMr('Foo') // => 'Hello Mr Foo'

Here greetMr is an example of a higher order function, CMIIW