Geomorphology is the scientific study of landforms, their processes, and the sediments shaping the Earth's surface—and, in some cases, the surfaces of other planets. It involves analyzing landscapes to understand how natural forces such as wind, water, and ice shape and transform the terrain. Landforms result from erosion and deposition, where rock and sediment are worn away, transported, and redeposited. Various climatic environments produce distinct landform patterns; for instance, the sand dunes of deserts contrast sharply with the glacial and periglacial features of polar and sub-polar regions. By mapping these landforms, geomorphologists gain insights into their formation and distribution.

Earth-surface processes continue to shape landscapes today, though often at imperceptibly slow rates. However, sudden events like landslides, floods, and other geological hazards—including volcanic eruptions, earthquakes, and tsunamis—can cause rapid and dramatic changes, sometimes posing risks to human populations. Over recent decades, advancements in remote sensing technologies and Geographic Information Systems (GIS) have significantly enhanced geomorphologists’ ability to analyze and interpret landform distributions globally.

Geomorphologists serve as "landscape detectives," piecing together the historical development of terrains. Many regions, such as Britain and Ireland, have undergone multiple glaciations over tens of thousands of years, leaving behind distinctive features like steep-sided valleys in the Lake District and drumlin fields in central Ireland. Scientists can reconstruct past climate conditions and environmental changes by studying landforms, sediments, and preserved organic materials—including pollen, beetles, diatoms, and macrofossils found in lake deposits and peat.

Geomorphology is a highly interdisciplinary field, with researchers specializing in diverse areas such as aeolian (desert) geomorphology, glacial and periglacial geomorphology, volcanic and tectonic geomorphology, and even planetary geomorphology. Many studies integrate knowledge from multiple disciplines, including ecology, geology, civil engineering, hydrology, and soil science, to offer a comprehensive understanding of how landscapes evolve and interact with natural and human influences.