An antique (Latin: antiquus; "old", "ancient") is an old collectable item. It is collected or desirable because of its age, beauty, rarity, condition, utility, personal emotional connection, and/or other unique features.
It is an object that represents a previous era or time period in human society. It is common practice to define "antique" as applying to objects at least 100 years old. Antiques are usually objects that show some degree of craftsmanship—or a certain attention to design, such as a desk or an early automobile.
They are bought at antique shops, estate sales, auction houses, online auctions, and other venues, or estate inherited. Antique dealers often belong to national trade associations, many of which belong to CINOA, a confederation of art and antique associations across 21 countries that represents 5,000 dealers.
Source: Wikipedia