This book is intended as an easy-to-use guide for persons interested in using MATLAB to develop programs which they can share, give or sell to others. Persons always working with bulks of data stored or saved in so many files will also find this book useful. The book illustrates, in simple manner, how to develop MATLAB programs (or scripts) which can be used by others in their own computers. It also explains how data or items contained in a file could be read into MATLAB, and how data from MATLAB can be written to files on the user's computer.