Node.js is built-on on the concept of single-threaded programming.
Node.js applications experience four types of errors.
Buffer is a module that allows the handling of streams that contain only binary data.
DNS module is used to connect to a DNS server and perform name resolution.
Global objects in Node.js are available in all modules.
Streams are the objects that let you read data or write data continuously.
The domain module intercepts errors that remain unhandled.
Node.js includes a debugging utility that can be accessed by a built-in debugging client.