What discharge in a gas is called non-self-sustaining; independent?

The discharge that occurs in the gas due to the action of external ionizers on it is called non-self-sustaining. A discharge that occurs in a gas without the effect of external ionizers on it is called independent.

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.