The best examples of aerial plants are the Banyan tree and the mop top Robinia. An aerial plant has roots above the ground. This allows them to compete for sunlight and nutrition more effectively.
Most aerial plants are found in tropical and equatorial regions of the world. In evergreen rain forests, the foliage is so thick that some plants have evolved aerial roots to allow them to absorb more sunlight. The development of aerial roots is thus an evolutionary process.
Aerial roots are often thick and spread around the parent tree. The Banyan tree can have several aerial roots as it gets older.