The portable baby chair category includes:
chairs are attached to the table, which should be solid and stable. Clamps need to be tight enough to hold it in place without damaging the table. Clip-on chairs generally have no foot support and usually fold or flatten for storage or transport.
Booster seats or chair-mounted seats strap to a chair and elevate the child to table height. They can have a tray and may be adjustable. Some travel-type seats fold up into a bag for easy portability.
Harnesses are strapped to a dining chair. They don’t elevate the child to table level, but have the advantage of being very compact and portable.
Floor seats are designed to support small babies (around 3-6 months old) when they are still learning to sit upright. They must only be used on the floor. They sometimes come with a tray.