Ever heard of React in the java context?
Java as in the computer software?  No I don't know anything more than the term Java.  What is react?
React is basically a javascript library for building user interfaces.
Does that mean you can write a program with script others have already made meaning you don't have to do as much work?
I believe so. It makes making user interfaces much simpler.
That sounds useful.  Have any well known apps/programs used react?
React (JavaScript library)
React (also known as React.js or ReactJS) is a JavaScript library for building user interfaces. It is maintained by Facebook and a community of individual developers and companies.
React can be used as a base in the development of single-page or mobile applications, as it is optimal for fetching rapidly changing data that needs to be recorded. However, fetching data is only the beginning of what happens on a web page, which is why complex React applications usually require the use of additional
announcement, phone calls to IBM's competitors revealed that almost everyone was having an 'executive meeting' involving the high-level officials who might be in a position to publicly react to the IBM announcement". Claiming that the new IBM computer competed against rivals' products, they were publicly skeptical about the PC. Adam Osborne said "when you buy a computer from IBM, you buy a la carte. By the time you have a computer that does anything, it will cost more than an Apple. I don't