Boundaries are the invisible lines and limits we set to define what’s acceptable in our relationships, protecting our physical, emotional, and mental well-being by establishing rules for our space, time, feelings, and resources, helping build trust, safety, and respect while maintaining self-care and personal autonomy. They can be physical, emotional, material, or time-based, allowing us to say “no” and control our own lives without being overly rigid or too porous in interactions with others.