Homeo means like or same. Stasis means state or condition. So, homeostasis means same condition .
Homeostasis is defined as the ability or tendency of an organism to control and maintain a constant or same internal environment. Such organisms can control and regulate their internal environment and maintain it in stable conditions.
Examples of homeostatic organisms are humans, in general mammals, etc. They are also called warm-blooded organisms, as they can maintain constant body temperature. They also have developed kidneys to control blood concentration and waste. Animals like snakes are not homeostatic. This means they are cold-blooded. They cannot maintain constant internal condition, like body temperature.