What is JavaScript?
If you are taking this course, you know that JavaScript is a popular client-side programming language. Client-side programs run on your computer's web browser. So, where can you see JavasScript on the web? When you visit a website and submit a form, that's JavaScript. The language is easy to use and learn. This article introduces several features of the language and some of the things you can do with it.
Browser security
Each browser tab has its own separate bucket for running code in (these buckets are called "execution environments" in technical terms) - this means that in most cases the code in each tab is run completely separately, and the code in one tab cannot directly affect the code in another tab - or on another website. This is a good security measure - if this were not the case, then pirates could start writing code to steal information from other websites, and other such bad things.
Note: There are ways to send code and data between different websites/tabs in a safe manner, but these are advanced techniques that we won't cover in this course.