In this chapter, we will explore how Julia interacts with the outside world, reading from standard input and writing to standard output, files, networks, and databases. Julia provides asynchronous networking I/O using the libuv library. We will see how to handle data in Julia. We will also explore Julia's parallel processing model.

In this chapter, the following topics are covered:

• Basic input and output
• Working with files (including CSV files)
• Using DataFrames
• Working with TCP sockets and servers
• Interacting with databases
• Parallel operations and computing