Manual testing can be mundane, error-prone and even exasperating. Frequent repetition of the same test cases with only slight changes in data values is laborious and time-consuming. Test automation alleviates testers’ frustration with low-level, repetitive testing while increasing the repeatability and accuracy of these tests. Automation enables testers to focus on more challenging and rewarding work such as risk analysis and exploratory testing.
I think we can all agree that automation is a critical part of any organization's software delivery pipeline, especially if you call yourself "agile." It's pretty intuitive that if you automate testing, your release cycles are going to get shorter. "So, if that's the case," you might say, "why don't we just automate everything?" There's a good reason: automation comes with a price.