Despite their vast array of properties, most 3D printing filaments share some common ground.  They all come as spools of thin plastic strand and are fed through a heated extruder nozzle to create 3D objects layer by layer.  They require specific temperatures for optimal printing, with some needing heated beds to prevent warping.  Most filaments are available in a wide range of colors, allowing for creative freedom in your designs.  However, the choice of filament ultimately depends on the desired properties of your final printed object, such as strength, flexibility, heat resistance, or printability.