Parental alienation is a psychological manipulation process where a child is led to feel unwarranted hostility towards a parent, especially during family separation or divorce, constituting a form of child abuse. This abuse can have long-term emotional effects including poor self-esteem, substance abuse, and problems with social connections. The document also discusses factors contributing to parental alienation, the strategies used by alienating parents, and the need for increased awareness and understanding of this issue.