What traits characterize intelligence?

Intelligence is characterized by three main features:
1) the ability to know, explore the world;
2) universality, presence in all types of mental activity;
3) heritability (mainly). Intelligence gets (or does not get) to us from our ancestors; environment and personal experience affect the degree of intelligence to a lesser extent.

Remember: The process of learning a person lasts a lifetime. The value of the same knowledge for different people may be different, it is determined by their individual characteristics and needs. Therefore, knowledge is always needed at any age and position.