29th February is Leap Day and usually occurs every four years to compensate for the difference between the solar year, which is the time it takes the Earth to go around the Sun, and the calendar year.
So, a leap year (also known as a bissextile year) has 366 days.
Leap is a synonym of jump and is used in other expressions:
Take a leap of faith = hacer un acto de fe
Look before you leap – ser precavido
Leap/jump to conclusions = sacar conclusiones apresuradas
Leap frog = correcalles (juego infantil)
We hope you enjoy your extra day!