What is a characteristic feature of artificial satellites?

Artificial satellites are indeed designed for various specific purposes, one of the key functions being communication. They facilitate the transmission of data, television signals, and internet connectivity across vast distances and remote areas. This capability allows for real-time communication and is essential for modern telecommunications systems, making it a defining feature of artificial satellites.

Other features such as those offered by natural satellites do not apply to artificial ones, nor do they invalidate the primary characteristics mentioned. Furthermore, while artificial satellites serve multiple roles, including scientific research and weather monitoring, they are not limited to just scientific applications, as they play crucial roles in numerous sectors, including military, civilian, and commercial contexts.