"Unique Visitors" refers to the number of distinct individuals who visit a website during a specific time period, typically measured over a day, week, or month. Each visitor is counted only once, regardless of how many times they return to the site within that timeframe. This metric helps website owners understand their audience size and engagement levels. Tracking unique visitors is important for digital marketing and website analytics, as it provides insights into user behavior and the effectiveness of online campaigns. Tools like Google Analytics are commonly used to measure unique visitors, helping businesses make informed decisions to improve their online presence.