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Article Contents

TITLE PAGE

1.INTRODUCTION

2.WHAT IS A GALAXY?

2.1.The World of Galaxies

2.2.The Limitations of Conventional Classification Schemes

2.3.The Physical Properties of Galaxies

3.WHERE DOES A GALAXY END?

3.1.Probing the Formation and Evolution of Disks - the Extent of the Neutral Hydrogen

3.2.Probing the Unseen Halos - Rotation Curves and Dark Matter

4.ARE GALAXIES OPEN OR CLOSED?

4.1.Communication with the Environment

4.2.Inflows

4.3.Outflows

4.4.Magnetic Fields

5.HOW IMPORTANT ARE INTERACTIONS?

5.1.Nature versus Nurture

5.2.Interaction-Driven Galaxy Formation

5.3.Subtle Interactions

6.SUMMARY

REFERENCES