Tell you about the relationship between Jelurida, Nxt, Ardor, Ignis

Most people will be puzzled when they see so many old and new terms. Apart from the fact that the nxt future currency and the Ardor majority are relatively clear, the relationship between them is not very clear. This picture describes the relationship of these nouns relatively clearly:

Jelurida BV, a holder of intellectual property rights for Nxt Software and the Ardor Platform, aims to create a sustainable and thriving business around the Nxt ecosystem by providing software licenses, maintenance and services for next-generation blockchain applications.
NXT is a blockchain public chain implemented in JAVA.

Ardor can be thought of as NXT 2.0, which inherits the basic features of NXT and expands on additional new features: sending information and voting.

Ignis is the first child chain of Ardor.

This is the link between them. You can start here to explore this unique product.
References:
https://www.jelurida.com/
https://citicoins.com/
https://www.reddit.com/r/NXT/comments/6dmhsv/nxt_introduction_and_frequently_asked_questions/
https://www.jelurida.com/ico
https://www.nxter.org/ardor-features-vs-nxt-features/