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A quarterly income statement shows performance for a three-month fiscal period, while an annual income statement summarizes the full fiscal year. Quarterly data is useful for tracking recent momentum and seasonality, while annual data is better for judging long-term growth, profitability, and business cycles.

YOY means year over year. It compares a financial metric with the same period in the previous year, such as this quarter's revenue versus revenue in the same quarter last year. YOY comparison helps investors see growth trends while reducing the impact of normal seasonal changes.

Important metrics include revenue growth, gross profit, gross margin, operating profit, operating margin, net income, EPS, R&D expenses, SG&A expenses, and tax expense. Investors usually look at these together to judge whether the company is growing, controlling costs, and improving profitability.

EPS, or earnings per share, is based on net income divided by the number of shares outstanding. It helps investors understand how much profit the company generated for each share, but it should be reviewed alongside share count changes, margins, cash flow, and valuation metrics.