Pollen samples are tiny grains collected from plants, which are essential for reproduction. These grains are produced by flowers and trees and can be found in the air, on surfaces, or in sediment. Scientists often gather pollen samples to study plant diversity, climate change, and even ancient ecosystems. Researchers analyze pollen samples to identify the types of plants that existed in a particular area at a specific time. This information can help in understanding the effects of climate change on biodiversity and can also assist in forensic investigations by providing clues about the environment at a crime scene.