What is 404 day?

404 Day is a day that is celebrated on April 4th each year to raise awareness about internet security, online safety, and the importance of preventing and fixing error codes such as the 404 error (page not found). This day is also an opportunity to educate people about the causes and solutions for common website errors and promote best practices for maintaining a secure and reliable online presence. It is observed by online security professionals, website developers, and internet users around the world.