A scuba mask is your window underwater, creating an air pocket over your eyes and nose so you can see clearly and equalize pressure. Unlike goggles, it covers your nose for breathing control.
Types include single-lens (panoramic view, easier to clear) and dual-lens (more modular, but higher volume). Beginners should start with single-lens frameless or low-profile masks—they're simpler, cheaper, and less prone to leaks.
Frameless means the skirt attaches directly to the lens for a sleeker fit; great for beginners as it's flexible and forgiving. Realistic expectations: Your first mask won't be perfect, but a good one lets you see fish clearly up to 20-30 feet without strain.
Evaluate by checking skirt softness, lens clarity, and user photos of fit. 'Beginner-friendly' means intuitive—no tools needed for adjustments, tolerates imperfect fit, and excels in shallow dives where most newbies practice.
Marketing terms: 'Purge valve' adds a drain but can trap water for beginners—skip it. 'UV protection' is nice but not essential for entry-level dives.