JSON is commonly used to describe structured data and it supports arrays. A JSON object is written as name- value pairs enclosed in braces, while an array is an ordered list enclosed in brackets. This makes JSON compact and easy for REST APIs, scripts, controllers, and network automation tools to exchange data. Cisco CCNA 200-301 v1.1 includes JSON because network programmability often requires reading API responses from systems such as Cisco DNA Center or device controllers. Option A describes markup-style languages such as XML or HTML, which use angle brackets and tags. Option D is backwards because XML is usually more verbose than JSON. Option C is too vague; JSON can be stored, but the defining exam feature here is its structured representation, including arrays. A fast way to recognize JSON is to look for curly braces, quoted keys, colons between keys and values, and square brackets when multiple values are grouped.