An attosecond is a unit of time in the International System of Units (SI) equal to 1×10−18 of a second (one quintillionth of a second). To put it into perspective, there are approximately as many attoseconds in one second as there are seconds in the age of the universe. An attosecond pulse of light is an extremely short pulse of light that lasts for 0.000000000000000001 of a second. Attosecond pulses have been used to study electron behavior in single molecules, such as how electron charge migrates and how chemical bonds between atoms break. Attosecond technology has also been applied to studying how electrons behave in liquid water as well as electron transfer in solid-state semiconductors. The ability to generate attosecond pulses has opened up new possibilities in various critical sectors, including quantum physics, biology, chemistry, and medicine.