Logs are the raw notes that help turn messy digital activity into clear security stories. Every website, device, and application constantly writes these notes in the background, even when people barely notice them. Security teams use logs to understand what really happened when something breaks or looks suspicious, instead of guessing based on incomplete memories or vague reports. A single log entry is like one sentence, recording who did something, what they did, when they did it, and how it turned out. Many entries together form events and alerts that highlight important patterns worth human attention. When beginners learn to read logs, they gain a powerful way to see behind the user interface and watch systems actually behaving. That skill lets them move from vague worries toward evidence based understanding of risk. Step by step, raw data becomes a readable security story.