File System & Streams

What is the difference between fs.readFile() and fs.readFileSync()?

This should read a file and log its content. Spot the bug:

const fs = require("fs")
fs.readFile("data.txt", (data, err) => {
  if (err) throw err
  console.log(data.toString())
})

Which encoding should you pass to get a string instead of a Buffer?

fs.readFile("file.txt", "_______", (err, data) => {
  console.log(data) // string, not Buffer
})