having lots of experience in marketing. Soft skills are the personal attributes, personality traits, inherent social cues, and communication abilities needed for success on the job. Soft skills characterize how a person interacts in his or her relationships with others.
Unlike hard skills that are learned, soft skills are similar to emotions or insights that allow people to “read” others. These are much harder to learn, at least in a traditional classroom. They are also much harder to measure and evaluate.
Soft skills include attitude, communication, creative thinking, work ethic, teamwork, networking, decision making, positivity, time management, motivation, flexibility, problem-solving, critical thinking, and conflict resolution.
Here's more information on the difference between hard skills and soft skills, and here is a longer list of soft skills.