Ponds are generally classified as water bodies that are smaller than lakes. Yet the size for cut off has not been agreed upon internationally. Both consist of standing water which is not flowing. Historically, ponds have been manmade for carrying out certain activities.

A pond is a small body of water where a person can stand without being completely submerged and which is shallow enough that the bottom can be reached by the sun’s rays, thus permitting rooted plants. So ponds can be termed as a naturally occurring small water bodies of shallow depth or manmade artificially created water bodies where light can penetrate to the bottom and rooted water plants may grow.

A pond lacks waves and is calm in nature. Garden ponds are commonly seen across the world. It is common for ponds to be filled with koi, resulting in koi ponds.

The koi is a large group of fish. Koi is a Japanese word for the carp and koi were first bred for colour in the 1820s. The koi is distinguished from other varieties of carp by its colour, pattern and scales. Koi are now commonly available with specialist dealers of fish suppliers and pet shops. In medieval times, it was common to have fish ponds and these still common in Europe and East Asia.