I'm new to JavaScript and recently learned about callbacks via a tutorial. The instructor mentioned that callbacks are used everywhere in code amongst JavaScript developers. What I understand so far is that these callbacks store a function within a function to be executed at a later time, but wouldn't it be simpler and more efficient to store a value in a variable and create a function that logs your desired output? Can’t the callback alternative (typed below) be executed at a later time as well? 

// Callback Example:
     
function callbackExample(name, callback){
    log(callback(name)); 
}

callbackExample('Adee Otana', function(name){
    return 'Hello ' + name; 
}); 
     
     
// Alternative: 

let name = 'Adee'; 
 
function callbackAlt(name){
    log('Hello ' +  name); 
}
 
callbackAlt(name);