What is IP65

Outdoor LED display must be stable enough to work well 7/24 and withstand extremely stormy or sandy-storm weather. For the manufacturers, it is required that outdoor led displays should meet the criterion at least IP65, so what is definition of IP65?

"The IP Code (or International Protection Rating, sometimes also interpreted as Ingress Protection Rating) consists of the letters IP followed by two digits and an optional letter. As defined in international standard IEC 60529, it classifies the degrees of protection provided against the intrusion of solid objects (including body parts like hands and fingers), dust, accidental contact, and water in electrical enclosures. The standard aims to provide users more detailed information than vague marketing terms such as waterproof