Every sports card collector will have their own category of baseball cards. It is common for them to categorize the cards according to their preference. Most of the sets that are common for categories of baseball cards have come from a vintage card and the popularity the card carried into this age. As there is a different category according to every collector, it is significantly difficult to keep track of the baseball cards and which category they fit in. Following is a list of the most common categories that are used to make sets of baseball cards.

Rookie card
For such a common term of the set, the rookie cards are generally hard to define.

Sub-set card
Sub-set cards are theme-based cards of the players as well as teams. They include types of cards like all-star cards, league leaders, and World Series or playoff cards.

Inserts
Insert cards are similar to sub-set cards in terms of theme and design, but they are not a part of a base card set. They are sold separately. Even the numbering on these cards is different from the main set of baseball cards. In some cases, the base cards do not even follow a numbering pattern. They are scarcer as compared to the base cards and are produced on the basis of ratios, for example, 1 in every 6 packs.