This book is commonly used a text for introductory courses in the philosophy of science. For people who are interested in the the history of debates within the philosophy of science -- not necessarily the history of science, or detailed treatments of scientific methodology -- this is a great introduction.
Philosophy of science deals with fundamental questions about the nature of scientific knowledge, scientific theories, and scientific reasoning. What is the ground of scientific knowledge? What counts as a scientific explanation? Is there such a thing as the "scientific method"? What is a scientific theory? How and why do scientific theories change over time? Does science ever give us the truth? What role to values play in science? And so on.
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There are many good introductory books on the philosophy of science, and this is one of them.