Emotional security is the measure of the stability of an individual's emotional state. Emotional insecurity or simply insecurity is a feeling of general unease or nervousness that may be triggered by perceiving of oneself to be vulnerable or inferior in some way, or a sense of vulnerability or instability which threatens one's self-image or ego.
The concept is related to that of psychological resilience in as far as both concern the effects which setbacks or difficult situations have on an individual. However, resilience concerns over-all coping, also with reference to the individual's socioeconomic situation, whereas the emotional security specifically characterizes the emotional impact. In this sense, emotional security can be understood as part of resilience.
The notion of emotional security of an individual is to be distinguished from that of emotional safety or security provided by a non-threatening, supportive environment. A person who is susceptible to bouts of depression being triggered by minor setbacks is said to be less "emotionally secure". A person whose general happiness is not very shaken even by major disturbances in the pattern or fabric of their life might be said to be extremely emotionally secure.