Who was the first person to orbit Earth?please describe briefly

The first person to orbit the earth in a spacecraft was the Russian Cosmonaut YURI ALEXEYEVICH GAGARIN (9th March 1934 to 27th March 1968).

On 12th April 1961 he became the first human to be in space and the first to orbit planet earth. The name of the spacecraft was Vostok I. The spacecraft was launched on 12th April 1961 at 6.07 hrs. and it landed back on the earth on 12th April 1961 at 7.55 hrs. He orbited once around the earth in 1hr 48 mins. The spacecraft was launched from the Baikonur Cosmodrome and it landed in Engels close to the Saratov region.

Gagarin's 'call sign' during the mission was "Cedar."