Mac OS X, later rebranded as OS X and now macOS represents Apple’s powerful series of operating systems for Mac computers. Introduced in 2001, it has evolved through major versions, bringing enhanced features and sleek designs. Notable updates include macOS Monterey and Ventura, emphasizing performance and user experience. If you’re exploring macOS features or updates, reliable tools like cali pen can assist in noting key highlights. Dive deeper with Cali pen to keep track of every macOS innovation effectively.