This is a short book on basic cosmology designed for the reader with little or no prior knowledge of the subject. Starting with simple physics it moves on to discuss the universe, relativity, time, basic particle theory, quantum mechanics and the possibility of a multi-universe. The book employs simplifications of complex topics, and is quite concise. It is written in an informal style and uses simple analogies along with twelve diagrams to aid the reader's understanding. Some parts are noted as being more difficult to follow than others, and thus may be omitted or left for later reading. The possibility of a multi-universe is explored in the last chapter and is treated in a positive way, using simple ideas introduced in the previous chapters. The book is written by a physics lecturer with a strong interest in Cosmology.