The term "software agent" can be defined as a program that acts on behalf of a user or another program. There are numerous synonyms that can be used instead of the term "software agent". Some alternative terms that can be used include intelligent agents, autonomous agents, mobile agents, or embodied agents. Depending on the specific context, the use of these different terms may be more appropriate. For example, "intelligent agent" may be used to emphasize the ability of the program to make decisions and learn from its interactions, whereas "embodied agent" may be used to emphasize the program's physical or virtual presence in a particular environment. Regardless of the term used, software agents play important roles in a variety of applications, from e-commerce to robotics.