Deflector shield (Earth-2356)

Deflector shields, or simply shields, are energy fields that can protect starships, battle stations, ground-based structures, and even armies from enemy assault. Several varieties of deflector shields exist, including ray shields, which deflect or scatter energy (although sometimes they are not powerful enough to fully negate enemy fire), and particle shields, which diffused impacts from high-velocity projectiles and proton weapons. A third type of shield, a concussion shield, repell space debris and other solid objects. Most starships utilize a combination of ray and particle shielding for maximum protection, while larger ships can require multiple projectors to fully protect the ship, with a shield's intensity gradually diminishing with distance from its projector. Some shields are one-way shields that only allow a person to come in through the shield, but prevent passage back out through the shield. Droidekas had a built-in shield that deflected normal blaster fire but could not stop solid objects such as a thermal detonators or people passing through, so long as they moved slowly enough.

Source

 * https://starwars.fandom.com/wiki/Deflector_shield