Is a high dividend yield a sign of a good investment or a warning sign?

A high dividend yield can be either, so context matters. Yield is the annual dividend divided by the share price, so a yield can spike simply because the stock price has crashed, sometimes signaling that the market expects a dividend cut, which is called a yield trap. A sustainably high yield backed by strong, growing earnings is attractive; an unusually high yield from a struggling company often precedes a painful cut. Rather than chasing the highest yield, look at whether the company can actually afford the payout, measured by its payout ratio and cash flow. Dividend-growth strategies that favor companies steadily raising payouts tend to be more reliable than pure high-yield strategies. Never buy a stock for its yield alone without understanding the underlying business health.