Nengajo are traditional Japanese New Year's greeting cards that people send to friends and family. These cards are typically decorated with festive designs, including images of the Zodiac animal for the upcoming year, auspicious symbols, and messages of good fortune. The custom of sending Nengajo dates back to the Edo period and is an important part of Japanese culture. People usually write their messages on Nengajo during the last days of December, ensuring they arrive by January 1st. The cards are often delivered by the Japan Post, which offers a special service to guarantee timely delivery. Sending Nengajo is a way to express gratitude and well-wishes for the new year.