Pet gates come in two main variations: people-friendly and pet-friendly.
Human-friendly gates for pets keep pets from getting through, while allowing humans access, usually with a latch for easy opening and closing.
Many freestanding pet gates take a bit of work to put up or take down, using tension against door frames as the main source of their stability. Many doorway pet gates come equipped with a hinged door to pass through more easily. Others are strictly barriers, either requiring you to take them down to get by or find another route to the other side.
Pet-friendly gates give animals free access in and out of an area, most often serving as a means to enter and exit the home.
Pet doors are the best example of a pet-friendly gate, installed into a wall or as part of a larger door. Your animal friends get complete freedom to come and go as they please and you don't have to get up at their every whim to let them in and out. Doors for pets also usually come equipped with handy locks to ensure your furry companions stay inside at night, giving you a little added peace of mind.