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# Introduction: callbacks # Introduction: callbacks
```warn header="We use browser methods here" ```warn header="We use browser methods here"
To demonstrate the use of callbacks, promises and other abstract concepts, we'll use browser methods. Namely, load scripts and perform simple document manipulations. To demonstrate the use of callbacks, promises and other abstract concepts, we'll be using some browser methods; specifically, loading scripts and performing simple document manipulations.
If you're not familiar with them, please read few chapters from the [next part](/document) of the tutorial. Or, hopefully, examples will be clear for you even without that. If you're not familiar with these methods, and their usage in the examples is confusing, or if you would just like to understand them better, you may want to read a few chapters from the [next part](/document) of the tutorial.
``` ```
Many actions in JavaScript are *asynchronous*. In other words, we initiate them now, but they finish later. Many actions in JavaScript are *asynchronous*. In other words, we initiate them now, but they finish later.