Friendliness is a necessary sub-skill of communication and it should be demonstrated both in verbal and non-verbal communication, oral or written. As it was mentioned previously a friendly tone and a smile encourage others to engage in honest communication with you. It is important to smile and be polite in face-to-face conversations, while personalizing an email will make the recipient feel appreciated. The use of humour is also recommended in communication. This is because laughing is found to release chemicals in the brain called endorphins which relieve stress and anxiety.