Any informal communication about company and personal matters outside the official network is called:

Option 1 -> Diagonal communication refers to formal communication that flows across different hierarchical levels and departments in an organization.

Option 2 -> Non Verbal Communication involves conveying messages through body language, gestures, and facial expressions rather than words, but can be both formal and informal.

Option 3 -> Verbal Communication refers to the use of spoken words to communicate, which can occur in both formal and informal settings.

Option 4 -> Grapevine is the informal communication network where unofficial information, rumors, and gossip about company and personal matters spread outside formal channels.

Hence, Option 4: Grapevine -> Grapevine is specifically defined as the informal communication channel that operates outside the official organizational network, carrying both work-related and personal information through unofficial means -> correct