Here's why:

* Surface tension is the tendency of a liquid's surface to minimize its surface area. This is due to the cohesive forces between the liquid molecules.

* A sphere has the smallest surface area for a given volume. This means that a spherical shape minimizes the surface area exposed to air, which reduces the energy required to maintain the surface.

Therefore, liquids naturally tend to form spherical drops because it's the most energetically favorable shape, minimizing surface tension.