What is the callback function in jquery, the callback function (callback)?

It is true that Daniel is more than

The Great God explains the following:

You go to a shop to buy things, just what you want to have no goods, so you left your phone in the shop clerk, after a few days the store has goods, the clerk called you, and then you received a call to the store to pick up the goods. In this example, your phone number is called a callback function, you leave the phone to the clerk called the registration callback function, the store later in the goods called triggered the callback associated event, the clerk called you called Call callback function, you go to the store to fetch goods called response callback event.

Changxiling
Links: https://www.zhihu.com/question/19801131/answer/13005983
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function getinput (Options, callback) {    alluserdata.push (options);     // Make sure the callback is a function    if (typeof callback = = = "function") {    // call it, since we had confirmed it is Callab Le        callback (options);    }}

What is the callback function in jquery, the callback function (callback)?