Explain in general terms the concept of voir dire

Explain in general terms the concept of voir dire. What is this process in the United States and how is it accomplished. Describe what ‘challenge for cause’ means. Describe the type of circumstances where a lawyer may want to make a challenge for cause. Describe what a ‘peremptory challenge’ means. Describe the type of circumstances where a lawyer may want to make a peremptory challenge. From a strategic perspective, which is more valuable to an attorney, a peremptory challenge or a challenge for cause? Explain.