What Is Shift-Left Testing and Why Is It the Next Big Thing?

What Is Shift-Left?

The journey of software development looks like this, even today:

As you can see, testers do not get involved in the early stages of software development such as requirement gathering or design or development. Testing has conveniently been moved to the extreme right in the full software development cycle. The consequences of following this approach come in the form of delaying launch dates because testing/fixing/retesting takes a lot of time when performed at the end or compromising the quality of the software by skipping this iterative process.