Landforms are features on the Earth’s surface that make up the terrain, such as mountains, valleys, plains or plateaus. Landforms are formed by both endogenic and exogenic forces. 

• Endogenic forces: Sudden forces like earthquakes, volcanoes, and landslides. 
• Exogenic forces: Erosional and depositional landforms formed because of agents like water, wind, sea waves and glaciers.

Further Reading:

• Erosional landforms
• Depositional Landforms