Hi Amar
Please check the following link which is a chapter published by BMJ and it explain the meaning of case control and cross sectional studies
http://www.bmj.com/about-bmj/resources-readers/publications/epidemiology-uninitiated/8-case-control-and-cross-sectional
Also, I found a similar question in researchgate that may answer your question.
https://www.researchgate.net/post/Can_anyone_tell_me_the_difference_between_case-control_study_and_a_cross-sectional_survey
Good Luck!
It is important to bear in mind that the main differences between Cross-sectional and other observational studies (Case-control and cohort) are assessment of exposure and outcome in terms of exposure evaluation in different time (Case-control and Cohort, the first start from outcome and end with exposure "like this article: http://www.sciencedirect.com/science/article/pii/S1526820917301350 " And later start from exposure and finish with outcome 'Framingham Study") or at a specific time.
In cross-sectional study we look at exposure and outcome at the same time "doing a Snapshot". Moreover, we cant find a causal association, just we report that a significant association was found.
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