A safe space is a place or environment where a person can feel confident that they will not be discriminated against, exposed, harassed, criticized or any other emotional or physical harm. A safe space can be your favorite bench, a person that you trust or even just your home. It's a place where you feel that you can not be harmed and no judgement will ever be placed on you for what you say, do or how you act.
Links for more information:
Safe Space
Safe Space Stories
Safe Space Podcast