BA and BS ? Clarification please :)?

Both a BA and a BS are Bachelors degrees, and take 4 years to complete. They reflect a difference in emphasis: whether you took a major in the humanities or arts versus a major in the sciences. Some degrees (e.g., a degree in psychology) will vary across schools: some will offer a BS and others offer a BA. This has little to do with the value of the degree, or the options you have later.