You know or feel that it is the case, but you cannot put into words or rationally substantiate why. And if you do not listen to that knowing or feeling because of practical objections or logical arguments, it turns out later that you should have.
Intuition, Combination of Internal Senses
Intuition is your own wisdom. It is a combination of different internal senses that together provide inner knowing, intended to enable you to develop as a soul. Think of inner hearing, for example, communication with your guide. Or inner seeing, for example, (unconsciously) reading the pictures in the aura of others, but also in your own.
Everyone carries a wealth of knowledge within them, only not everyone has access to it because the line is muddled. Access to your own wisdom can be developed.