A group of approximately thirty Galaxies close to each other (astronomically speaking) is defined by this name, of which our Milky Way Galaxy is also part.
The largest and most massive galaxy in this group is the famous Andromeda Nebula, which is also indicated by the acronym M 31 of the Messier catalog or NGC 224 of the New General Catalog. Its distance from us is around 2.2 million light years.
Secondly, in relation to the dimensions of lac galaxies belonging to the local group, there is the Milky Way, and in the third the M 33 Galaxy of the constellation of the Triangle. These three galaxies are of the spiral type.
As far as the others are concerned, it is usually dwarf galaxies, satellites of the largest (very close to us are the Great and Small Magellanic Cloud). The galaxies of the local group that appear gravitationally related occupy a region whose diameter is calculated in about three million light years.