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There are two varieties of star clusters:

• Galactic or Open Clusters; and
• Globular Clusters

Galactic clusters are very young objects and are generally confined to the galactic plane.  They arise because stars typically form together within large molecular clouds.  Because of their youth they are often accompanied by the nebulosity of the star forming region.  They can be practically any shape and have varying degrees of central condensation.

Globular clusters, by contrast, are usually extremely old.  They generally have spherical symmetry and can either have strong central condensation or be weakly condensed, sometimes more closely resembling a galactic cluster.  They mostly appear in the galactic halo.

NGC104

NGC 288

NGC 1841

NGC362

M46

NGC 3201

NGC 4372

Omega Centauri

NGC 4755

NGC 5986

M4

NGC 5460

NGC6380

NGC 6362

NGC 6397

NGC 6440

M22

NGC6752