The 4 (four) attachment styles are:
Secure. Those with this attachment style are confident in their relationships and can function independently while giving and getting support from their partner when needed.
Dismissive-avoidant. Those with this attachment style are often highly independent and don't want to rely on others for emotional fulfillment, so they avoid emotional closeness.
Anxious-preoccupied. Those with this attachment style are often overwhelmed with anxiety at the thought of their partner leaving them. They need constant reassurance from their partner that they won't be abandoned, and can be described as clingy.
Fearful-avoidant. Also known as disorganized, those with this attachment style may crave intimacy but also fear it, because they fear they may get hurt. These people may have trouble regulating their emotions as a result of neglect or abuse. This is the least common attachment style.
Attachment issues often stem from childhood, when caregivers don't properly provide the emotional security that children need to thrive.