What is good PE ratio?

Could you elaborate on what constitutes a good Price-to-Earnings (PE) ratio? I've heard it's a crucial indicator for evaluating a company's financial health, but how do I determine if a PE ratio is favorable? Does a low PE ratio always indicate a more profitable investment? Or are there other factors I should consider? Also, how do I compare the PE ratio of a company with its peers in the same industry? Understanding the nuances of PE ratios would help me make more informed investment decisions.