What is iReport , jasper Report , jfreechart How they are related ?

At first lot of doubts arise in my mind

iReport?

iReport is a graphical/visual tool for creating jasper reports.Design the report drag and drop do necessary changes ....s. Dynamic content is created using Parameters, Fields and  Variables . A XML file is created with extension jrxml for you.

What I found in their site is
iReport is a visual report designer for JasperReports. The library is a report engine that can be integrated in your open or commercial application to generate the reports designed with iReport, display them on screen or export them in a final format like PDF, OpenOffice, DOCX and many others. Alternatively, you can stream the result through a web application or send the final document directly to a printer. JasperReports is in some way the core of iReport.

JasperReports
Engine that takes the XML file and forms a report out of that file using the data source specified in the XML file.

jfreechart 
Library for generating charts like bar,line,pie etc.

Introduction

When I start my report generation with iReport I totally fed up. Being a starter, there is not much online help or tutorials. Take a lot of time in the beginning .After familiar I thought of starting this blog for fresh people like me.

Here I am planning to write whatever I know  with my little time after work and family.