Abstract and Introduction, the differenceWatch
Intro: background information, putting the research in context by giving an overview of the previous work on the topic and what questions will be addressed later. Has references.
Say, if you do an experiment on how high can you jump, your abstract is 'The paper look at jumping height. samples are taken and the median is 10 m'. Your intro is 'jumping height are a fascinating subject. through various method, we examine the height an average student can jump'