New Users represents the count of unique individuals visiting your website for the first time during a specified measurement period. Google Analytics identifies new users through client IDs—unique identifiers automatically assigned when someone first visits your site. This identification system relies primarily on browser cookies, though GA4 has enhanced this with additional signals including Google account information (when available) and device fingerprinting to improve accuracy across sessions and devices. A user is classified as "new" until Google Analytics can match them to a previous visit through these persistent identifiers.

Website Visits, also referred to as sessions, track the number of times users interact with your website during distinct periods of engagement. Each visit, or session, represents a continuous interaction that begins when a user arrives and ends after 30 minutes of inactivity or when they leave the site.