Secure and insecure attachments are examples of a particular type of style of attachment bond that may be established between any two individuals (usually the mother and infant).
Attachment is a two-way, enduring, emotional tie between two people (usually and infant and their primary caregiver). An attachment is usually shown in the behaviour between two people. An attachment between an infant and primary caregiver is usually reciprocal (responding to the action of another with a similar action). This attachment (tie) usually develops in set stages within a fairly set timescale.