RTR (Ready-to-Run) and kit are two different types of RC (remote control) car available for purchase. The main difference between the two is the level of assembly required before the car can be used.

RTR (Ready-to-Run) RC cars are fully assembled and ready to run out of the box. These cars typically come with everything you need to get started, including the car, a remote control, batteries, and a charger. They are a great option for beginners or those who want to quickly get started with RC car racing or hobby. RTR cars are generally easier to set up and can be driven right out of the box, but they offer less customizability and upgrade options.

On the other hand, kit RC cars are not fully assembled and require a certain level of assembly before they can be used. These cars come with all the necessary parts and instructions for assembly, but the builder must put the car together themselves. Kit cars are a great option for experienced RC enthusiasts who want more control over the final product, and enjoy the building process. Kit cars can be more challenging to set up and they require more knowledge and technical skills, but they offer more customizability and upgrade options.

In summary, RTR cars are ready to run right out of the box, while kit cars require assembly and offer more flexibility in terms of customization and upgrades. Both have their pros and cons, and the best option depends on your experience level and what you are looking for in an RC car.