National Email Day is celebrated on April 23 to honor the invention of email and its significant impact on modern communication. The date was chosen to recognize Ray Tomlinson, credited with creating email, who introduced the "@" symbol to separate user names from machine names. This day encourages people to reflect on how email has transformed communication in business, education, and personal relationships. Typical customs may include sharing stories about email's evolution, discussing its role in daily life, and appreciating its simplicity and efficiency. As email continues to evolve, National Email Day serves as a reminder of its importance in connecting people worldwide.