Most skills come with a descriptive definition. In addition to grouping skills by similarity, they also sort them according to three classifications: Common Skills are prevalent across many different occupations and industries, including both personal attributes and learned skills. (e.g. "Communication" or "Microsoft Excel"). These include soft skills, human skills, and general competencies. Specialized Skills are more specific They’re primarily required within a subset of occupations or equip one to perform a specific task (like "NumPy" or "Hotel Management"). These are sometimes known as technical skills or hard skills. Certifications are recognizable qualification standards assigned by industry or education bodies (including “Cosmetology License” or “Certified Cytotechnologist”).