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 authors: flaviocopes, potch, MylesBorins, RomainLanz, virkt25, Trott, onel0p3z, ollelauribostrom, MarkPieszak, fhemberger, LaRuaNa, FrozenPandaz, mcollina, amiller-gh, ahmadawais, saqibameen, dangen-effy, aymen94, benhalverson
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+--- 
 
 # Introduction to Node.js
 
-Node.js is an open-source and cross-platform JavaScript runtime environment. It is a popular tool for almost any kind of project!
-
+Node.js is an open-source and cross-platform JavaScript runtime environment. It is a popular tool for almost any kind of project
+A runtime environment typically means an environment that executes code .
 Node.js runs the V8 JavaScript engine, the core of Google Chrome, outside of the browser. This allows Node.js to be very performant.
 
 A Node.js app runs in a single process, without creating a new thread for every request. Node.js provides a set of asynchronous I/O primitives in its standard library that prevent JavaScript code from blocking. In addition, libraries in Node.js are generally written using non-blocking paradigms. Accordingly, blocking behavior is the exception rather than the norm in Node.js.
 
 When Node.js performs an I/O operation, like reading from the network, accessing a database or the filesystem, instead of blocking the thread and wasting CPU cycles waiting, Node.js will resume the operations when the response comes back.
 
-This allows Node.js to handle thousands of concurrent connections with a single server without introducing the burden of managing thread concurrency, which could be a significant source of bugs.
+This allows Node.js to handle thousands of concurrent connections with a single server without introducing the burden of managing thread concurrency, which could be a significant source of bugs. 
 
 Node.js has a unique advantage because millions of frontend developers that write JavaScript for the browser are now able to write the server-side code in addition to the client-side code without the need to learn a completely different language.