Implicit theories of intelligence are beliefs about intelligence - what it is, how it works, and how it can be acquired or developed. Basically, it's belief about how we learn or figure out things. These beliefs can be either positive (believing that you can get better at things with practice) or negative (thinking that intelligence is something you can't change and can only be born with). For example, if someone believes intelligence is something you can't change, they are likely to give up easily when faced with a difficult task because they don't think they can get better at it. However, if someone has a positive theory of intelligence and believes they can improve with practice, they'll be more likely to put in the effort needed to get better.