Intimacy is built up over time, and it requires patience and effort from both partners to create and maintain. It involves being open and talking through your thoughts and emotions, letting your guard down (being vulnerable), and showing someone else how you feel and what your hopes and dreams are.
It means being able to share a whole range of thoughts, feelings and experiences that we have as human beings. Intimacy in a relationship is a feeling of being close, and emotionally connected and supported.