Planet Yardrat is the planet on which Goku crash-lands on after his fight with Frieza on Planet Namek. Yardrat was the planet the Ginyu Force was scheduled to invade before being relocated to Namek. When Goku could not start Frieza's spaceship, he found the Ginyu Force ships nearby and took one of them, and the coordinates for Yardrat were already programmed on the ship's computer.
While on the planet, the "Yardrats" nurse Goku back to health and soon afterward he is taught the Instant Transmission technique. Goku stays on the planet for about a year before heading back to Earth.