What is the significance of the 'console.log()' function in JavaScript?

The 'console.log()' function in JavaScript is significant primarily because it outputs messages for debugging purposes. When developers write code, they often need to see what values are being processed or track the flow of execution. Using 'console.log()', one can print these values or messages to the console, which helps identify issues or verify that the code is functioning as intended.

This debugging process is crucial for developing efficient code, as it allows programmers to pinpoint where errors might occur and to understand state changes throughout their program's lifecycle. It's a fundamental tool for any developer working with JavaScript, facilitating easier troubleshooting and enhancing the overall coding experience.