What is automation and why you use automation?

Answer 1

Automation is the use of machines to do the things people would otherwise have to do. The reason for automation is that machines can work far more quickly economically and consistently then people do. Especially these days when the amount of gadgets people use would just not get built if it was not for machines doing them.

Answer 2

In an Agile world, industry is adopting shift-left approach. The Agile approach requires iterative development and rapid executions; hence automation plays major role as it brings in necessary agility to testing. Shifting left gives a greater ability to automate testing. Automation has become almost indispensable in rapidly changing industry.

It is necessary to have mindful considerations and calculated decisions (e.g., Automation tool, Framework, Testing Scope, Platform coverage, etc.) to have efficacious automation in place.