Here's a breakdown:

* Neutron Stars: These are the collapsed cores of massive stars that have exploded as supernovae. They are incredibly dense, packing the mass of the Sun into a sphere only about 20 kilometers across. This extreme density creates immense gravitational pull, making them the most powerful gravitational sources in the universe after black holes.

* Magnetars: These are a special type of neutron star with extraordinarily powerful magnetic fields, trillions of times stronger than Earth's. These fields are so intense they can distort the shape of the star itself and emit powerful bursts of radiation, including gamma rays.

While both neutron stars and magnetars have intense gravitational fields, magnetars stand out for their exceptionally strong magnetic fields.