Final answer:
The availability heuristic is a cognitive bias that leads people to estimate the likelihood of events based on their availability in memory. If instances come readily to mind, people may mistakenly perceive them as more common than they actually are.
Step-by-step explanation:
The subject of this question is Psychology.
The availability heuristic refers to the tendency to estimate the likelihood of events based on their availability in memory. If instances come readily to mind, we might presume such events are common. This heuristic occurs when people take easily remembered instances as being more representative than they objectively are. For example, if we easily remember instances of violent crime or terrorism, we may incorrectly think that the chances of experiencing these events are high, even though they are actually rare occurrences compared to other causes of death.