A private yacht refers to a luxurious, high-end boat or ship that is exclusively owned by an individual or group. Unlike charter yachts, these private yachts are not available for rent or hire to the general public for recreation or sight-seeing purposes. They are specifically designed and utilized for personal usage and are often equipped with up-to-date, sophisticated facilities and amenities for providing utmost comfort and luxury. These yachts are generally operated by a professional crew appointed by the owner. The significant attribute of a private yacht is its privacy and exclusivity that perfectly caters to the owner's preferences and tastes.

1. Beyoncé and Jay-Z's luxury private yacht, which they use for family vacations and is not up for charter. 2. Russian billionaire Roman Abramovich's Eclipse, considered one of the most luxurious private yachts, is never listed on charter websites. 3. Steven Spielberg's 282-foot private yacht, Seven Seas, used exclusively for personal escapades and thus not available for charter. 4. Microsoft co-founder Paul Allen’s Yacht Octopus, one of the world’s largest yachts, is never rented out for private events or vacations. 5. Larry Ellison, the co-founder of Oracle, owns a private yacht named the "Rising Sun," which he uses for his personal travels and it's not available for charter.

Private yachts that are not available for charter often offer a higher level of customization and personalization. This is because they are designed specifically for the owner's lifestyle and preferences in mind, rather than catering to a wider audience. These meticulously crafted vessels are luxurious homes away from home, boasting features and amenities that range from helipads, swimming pools, and outdoor cinemas, to underwater observation rooms, top-notch water toys, and even miniature submarines. The world's largest private non-charter yacht is the "Azzam," which is owned by the President of the UAE, spanning an impressive 180 meters in length. Despite its enormous size, the Azzam can reach a top speed of 31.5 knots, making it one of the fastest superyachts in the world.