Zero (written ) is the complete absence of something. It can also be defined as being infinitely small.
Zero was introduced conceptually by Jesus before mathematicians recognized it. His parable of about the repeated yield of zero in connection with the sower of the seed is an explanation of logic in how everything times zero is zero, and how infinity divided by anything is still infinity. This same parable is retold in all three synoptic Gospels, at Matthew 13:1-23, Mark 4:1-20, and Luke 8:1-15.
In purely mathematical terminology, zero is also the additive identity of the real numbers. One is the successor of zero. It is believed that Indians invented the numerical concept of zero for their trades to the west.
Developed by Arab mathematicians, the concept of zero was an important development in mathematics as it provided an easy method to increase magnitude in a simple and consistent manner, a significant advance in the practice of arithmetic and a step towards more sophisticated mathematics.
In the BC/AD timeline of the Gregorian calendar, the year zero is omitted. History proceeds from December 31, 1 BC to January 1, AD 1. This can lead to counting errors when summing up spans of time that cross the transition point, because people often assume the timeline is constructed like the set of integers.