A slot is a narrow opening, usually in the form of a slit or groove. A slot is a common feature on many different types of machines and can be used to carry coins, tokens, paper tickets or cards. You can also find slots on airplane wings to improve airflow, and in many other places. You can even place your letters through the mail slot at the post office.
A slot can also be a position in an org chart, a role on a team, or a place where you work. Often, slots are created in order to manage content that would be difficult to keep track of otherwise. For example, you might create a slot to store information about the status of an ongoing project or for a document that is constantly changing.
A slot is a dynamic placeholder that either waits for content (a passive slot) or calls out to it to fill it in (an active slot). The content a slot contains can be determined by using an Add Items to Slot action or a renderer. It is generally not recommended that you use more than one scenario to feed content into a slot because it can give unpredictable results.