"Predictably Irrational" is a book by Dan Ariely that explores the hidden forces that shape our decisions. It reveals how our choices are often influenced by irrational behaviors, rather than pure logic. Through various experiments, Ariely demonstrates that people frequently make decisions that contradict their best interests. The book highlights several key concepts, such as the impact of social norms, the influence of expectations, and the effects of emotions on decision-making. By understanding these patterns, readers can become more aware of their own irrational behaviors and make better choices in their daily lives.