diff --git a/units/en/unit1/glossary.mdx b/units/en/unit1/glossary.mdx
index ed2b0aaa..7db80ef8 100644
--- a/units/en/unit1/glossary.mdx
+++ b/units/en/unit1/glossary.mdx
@@ -4,7 +4,7 @@ This is a community-created glossary. Contributions are welcome!
 
 ### Agent
 
-An agent learns to **make decisions by trial and error, with rewards and punishments from the surroundings**.
+An agent learns to **make decisions by trial and error, with rewards and punishments from the surroundings**. In other words - an agent is the entity that interacts with the environment, makes decisions, and learns from the rewards or penalties it receives. The agent's goal is to find an optimal strategy (policy) to maximize its cumulative reward over time.
 
 ### Environment