Wikipedia and similar websites are considered adequate for general information but not suitable for rigorous academic research. While Wikipedia provides detailed information, particularly in fields like mathematics, it is not reliable for Ph.D.-level research that requires data extrapolation. It is viewed as a valid resource for school essays and background information, similar to traditional encyclopedias. Users should avoid citing Wikipedia directly, especially for theses, but it can serve as a useful starting point to find reputable references and gain an overview of a topic. The technical information on Wikipedia is generally of good quality, though it may lack the depth needed for comprehensive research.