An eyewitness account is a firsthand description or narration of an event as experienced by an individual who was present during that event. These accounts are crucial for understanding historical events because they provide personal insights, emotions, and perspectives that can help paint a more vivid picture of the circumstances surrounding the event. In the context of significant upheaval like the Russian Revolution, eyewitness accounts reveal the experiences and reactions of various individuals, contributing to a richer understanding of the period's complexity and impact.