This document provides an overview of exploratory testing. It discusses how exploratory testing involves simultaneous test design, execution, and learning. Exploratory testing is tester-centric and relies on heuristics. The tester explores the product by playing around with different features and inputs, looking for anything unusual. Their testing is guided by mental engagement techniques like alternation and branching. Exploratory testing can involve different levels of documentation and formality. It is focused on revealing new information rather than just confirming existing knowledge.