OKRs (Objectives and Key Results) are a goal-setting framework where objectives are ambitious goals and key results are measurable metrics to track progress towards objectives. The framework was invented in 1954 and popularized at Intel and Google. Objectives should be memorable descriptions of desired outcomes, while 2-5 key results per objective express quantifiable milestones. Regular reviews help evaluate progress and refine future OKRs, which are meant to be challenging but achievable stretch goals rather than tasks. Common best practices include transparency, simplicity, and alignment across levels.