Why Nostr? What is Njump?

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Public Key
npub17hsm6st8csgwzqv3wv9jj4wdw0hm5eehesh0z955fmylft2scersux0qz9
Profile Code
nprofile1qqs0tcdag9nugy8pqxghxzef2hxh8ma6vumucth3z62yaj0544gvv3crn8n8j
Author Public Key
npub17hsm6st8csgwzqv3wv9jj4wdw0hm5eehesh0z955fmylft2scersux0qz9