The term 'techie' is a slang term used to describe someone who is knowledgeable and enthusiastic about technology. It is often used to refer to computer experts, software engineers, and other professionals in the tech industry. The term 'NERD' is also used to describe someone with an interest in technology, but it typically implies a more socially awkward individual. Both terms are often used interchangeably, but there are subtle differences between them.