Social support is the help, advice, and comfort that we receive from those with whom we have stable, positive relationships. Importantly, it appears to be the perception, or feeling, of being supported, rather than objective number of connections, that appears to buffer stress and affect our health and psychology most strongly.
Close relationships refer to those relationships between friends or romantic partners that are characterized by love, caring, commitment, and intimacy.
Attachment is a deep emotional bond between two people, a "lasting psychological connectedness between human beings." Attachment theory, developed by John Bowlby during the 1950s, is a theory that remains influential in psychology today.