Difference between a parrot and a parakeet

Budgie(Parakeet)

Any not-too-large parrot with a long tail is likely to be called a parakeet. So all parakeets are parrots, but not all parrots are parakeets. Many parrots are known by either name, parrot or parakeet. Usage varies by region. In the US, "parakeet" is commonly (if incorrectly) used to refer exclusively to budgerigars - an Australian birdthat Australians don't call a parakeet (Australians tend to reserve the term mostly for grass parakeets). Many South and Central American parakeets are known as conures. Smaller lories are usually called lorikeets instead of parakeets.

South Indian Parrot(Parakeet)

African Grey Parrot(Parrot)