Multi Walled Carbon Nanotubes possess multiple single-walled carbon nanotubes, which are nested inside one another. They have a 3-30 nm diameter and can be grown several centimeters in length. Its properties include an increased mechanical performance with enhanced magnetic and electrical properties. The high aspect ratio makes it suitable for polymer composites as adsorbents. Its applications are wide in various fields, including medicine, electronics, chemical, energy, and mechanics. It can be efficiently used in drug delivery, biosensors, lithium batteries, gas discharge tubes, nanoprobes, and hydrogen storage. They also have a strong adsorption affinity for environmental contaminants.