The Jeep is a vehicle which was used by HYDRA and stolen by Black Widow who briefly used it on a mission to retrieve Loki's Scepter.
When the Avengers arrived at Sokovia to retrieve Loki's Sceptre from Baron von Strucker. To be able to keep up with the Avengers, Black Widow steels one of HYDRA's jeeps so she and Hawkeye can fight the HYDRA soldiers and move around faster.
When all the Avengers regrouped to attack the HYDRA soldiers, Black Widow crashed the jeep as she and Hawkeye jumped out to continue fighting on foot.
During the battle, Captain America performs a backflip and throws it at a Jeep filled with HYDRA soldiers causing it to crash.