What is is a Pisces?

Answer 1

It's one of 12 astrological signs. People born in certain time periods have certain astrological signs. Those born from February 20 to March 20 are considered Pisces individuals. Every sign is said to give certain traits to the people born under them; which definitions vary depending on where you look.
People born under the same element signs are said to be compatible.

Water Signs

Pisces February 20 - March 20

Scorpio 23 October - 22 November

Cancer 21 June - 22 July

Fire Signs

Sagittarius 22 November - 21 December

Leo 22 July - 23 August

Aries 20 March - 19 April

Wind Signs

Gemini 20 May - 21 June

Libra 22 September - 23 October

Aquarius 20 January - 18 February

Earth Signs

Taurus 19 April - 20 May

Virgo 23 August - 22 September

Capricorn 21 December - 20 January

Answer 2

it's a constellation