How is a pest defined in simple terms?

A pest is defined as any unwanted organism, which encompasses a broad range of entities that can negatively impact human activities, health, or the environment. This definition goes beyond just harmful bugs or insects, as it includes plants and other organisms that may not traditionally be viewed as pests but still pose challenges or nuisances. For example, a plant may overgrow and disrupt native ecosystems, or small mammals can invade crops. By focusing on the aspect of being unwanted, this definition captures the essence of what identifies a pest in various contexts, reinforcing the idea that the classification relates to the perception and impact of the organism rather than its taxonomic category or degree of damage caused.