A magnetic field is an unseen vacuum that surrounds a magnet. A magnetic field is a term that describes how magnetic force is distributed around a magnetic object.
When an electric charge/current moves in the vicinity of a magnet, magnetic fields are formed or generated. A magnetic field is generated when a subatomic particle with a negative charge, such as electrons, travels around. Magnetic objects' atoms, as well as electrical conductors and wires, can generate these fields.
The magnetic field can be represented in a variety of ways. It can be interpreted mathematically as a vector field that can be plotted as different sets on a grid. The use of field lines is another choice. Lines are used to linking the set of vectors. The magnetic field lines never cross and never come to a halt here.