Non-GAAP operating income and non-GAAP operating margin exclude the expenses related to stock-based compensation (SBC).

ENGADGET: Google's Q4 2011 results: $2.71 billion profit, $8.13 billion in revenue, Wall Street disappointed

The following tables include information about non-GAAP gross margin, non-GAAP operating expenses, non-GAAP operating income, non-GAAP net income, and non-GAAP earnings per share (collectively, the "non-GAAP financial measures"), which are not measurements of financial performance prepared in accordance with U.S. generally accepted accounting principles.

ENGADGET: Dell reports Q4 2013 earnings: $14.3 billion in revenue as profits plummet 31 percent year-over-year

We define non-GAAP operating income as operating income plus expenses related to SBC, and, as applicable, one-time events.

ENGADGET: Google's Q4 2011 results: $2.71 billion profit, $8.13 billion in revenue, Wall Street disappointed