When looking for personality tests online, it's important to ensure that they are based on scientific research, have clear instructions and scoring, and provide meaningful feedback and recommendations. Four popular personality tests that can help improve career prospects are the Myers-Briggs Type Indicator (MBTI), the DISC Assessment, the Enneagram, and the StrengthsFinder. The MBTI assesses preferences on four dimensions: extraversion/introversion, sensing/intuition, thinking/feeling, and judging/perceiving. It provides a four-letter code that describes your personality type. The DISC Assessment measures behavior on four dimensions: dominance, influence, steadiness, and conscientiousness. It gives a graph and report that shows your dominant style. The Enneagram identifies your personality type based on nine basic motivations and provides a number and name that describes your type. Finally, the StrengthsFinder reveals your top five talents and provides a list and description of your strengths. Each of these tests can help you learn about yourself in order to maximize success in the workplace.