Econometrics has been a rather intimidating academic subject that both undergraduate as well as postgraduate students come across in courses of mainly economic nature. In spite of the daunting element attached to it, econometrics can be a rather exciting subject for both teachers and students. Complicated issues that individuals, businesses and policy makers are trying to address can be investigated thoroughly providing quantitative answers to important quantitative questions. Econometrics provides a platform on which complicated relationships are exposed, driving hence key players in the economy to base their decisions. An Introductory Note on Econometrics is a supplementary book that primarily aims at presenting key themes in econometrics in a rather concise and effective way. It can be perceived as an effort to brush up the memory of students who have been taught econometrics before and/or enable the 'mere tyros' to this subject to gain an insight into the basic concepts that pervades the world of econometrics.