Impressions refer to the initial thoughts or feelings that arise when encountering a person, object, or situation. These reactions can be influenced by various factors, including appearance, behavior, and context. For example, a person's clothing or body language can create a strong impression during a first meeting. In marketing, impressions are often used to measure how many times an advertisement is displayed, regardless of whether it is clicked. This metric helps businesses understand the reach of their campaigns. For instance, a social media post may generate thousands of impressions, indicating how many users saw it, even if they did not engage with it.