A collectable is any object regarded as being of value or interest to a collector. Collectable items are not necessarily monetarily valuable or uncommon. There are numerous types of collectables and terms to denote those types. An antique is a collectable that is old. A curio is something deemed unique, uncommon, or weird, such as a decorative item. A manufactured collectable is an item made specifically for people to collect.
A set of collectable teaspoons from World Expo 88
Collectible Soviet gold rings with rubies
The original iPhone in its box. Unopened "vintage" items which are part of popular brand lines are widely regarded as collector's items.
The hobby of collecting includes seeking, locating, acquiring, organizing, cataloging, displaying, storing, and maintaining items that are of interest to an individual collector. Collections differ in a wide variety of respects, most obviously in the nature and scope of the objects contained, but also in purpose, presentation, and so forth. The range of possible subjects for a collection is practically unlimited, and collectors have realised a vast number of these possibilities in practice, although some are much more popular than others.
A collection of nutcrackers
Stamp album used for collecting postage stamps
Numismatic and philatelic collectable specimens on display at an exhibition in India
Herbert Kullmann, picture sale catalogue by Bernheim-Jeune, Paris, May 1914.