A boundary is what separates you from me.
Boundaries separate your physical space, your feelings, needs, and responsibilities from others. Your boundaries also tell other people how they can treat you – what’s acceptable and what isn’t. Without boundaries, people may take advantage of you because you haven’t set limits about how you expect to be treated.
For some of us, however, as a result of our upbringing or traumas, boundaries are difficult to enforce or unhealthy.