An inference draws conclusions based on evidence gathered through observation. The conclusion is reached logically on the basis of facts known to be true or assumed to be true. An inference can be seen as an interpretation of what is observed. An inference is an element of reasoning, an act of thinking.
Observation is a process of carefully monitoring something like an effect or change, whereas the inference can be define as the process of examining the results of the observational process, comparing it with the detail theory of the related topic and checking the reliability of the results obtain after the observational process.
