Stabilisers are things that help keep something steady or balanced, like the extra wheels on a bicycle for beginners.
Stabilisers are usually seen as helpful and good because they make things safer and easier.
Examples:
The stabilisers on the bike help me to ride without falling.
She needs stabilisers on her skates so she doesn't fall.
The stabilisers on the airplane keep it steady in the air.
The stabilisers on the boat keep it from tipping over.
The stabilisers on the chair make it impossible to tip over, even if you try really hard.
The stabilisers on the shelf keep it from wobbling.