Apathy is the "absence or suppression of passion, emotion, or excitement; or lack of interest in or concern for things that others find moving or exciting." When someone isn't engaged enough to show any interest, they are said to not care about that which is the subject of their disinterest. People who are engaged, who are interested, are motivated to act and so they do; they speak up, ask questions, argue, file complaints, ask for refunds, click the Like button, share an article, comment on a thread, and so on. Those who act are said to care.