What is EGIS?

Unfortunately, "EGIS" is a very general term and without more context, it's difficult to provide a specific and accurate description. It could refer to various technologies depending on the field. To provide a helpful explanation, I need more information about the specific context in which you encountered 'EGIS'. For example, it might stand for something like Enterprise Geographic Information System, Educational Grant Information System, or something else entirely. Providing more context would help me narrow down the possibilities and give you a useful explanation. Without that, I can only say it's likely an acronym for some technology or system.