An ability is an effect generated by a card's or rule's text. There are several different types of abilities with different rules, timing, and resolution. The two main classifications of abilities are constant and triggered. Triggered abilities are further broken down into paid abilities and conditional abilities. Other types of abilities include prevent/avoid abilities and click abilities.

Page 21, Column 1, Paragraph(s) 2, Core Rule Book
There are two different types of card abilities in Android: Netrunner: constant abilities and triggered abilities.
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