Question

If something is new, how can it be both new and improved?​

Answer 1

Answer:

1 : to advance or make progress in what is desirable.

2 : to make useful additions or amendments. Other Words from improve Synonyms & Antonyms Choose the Right Synonym Example Sentences Learn More About improve.

Answer 2

Answer:

often heard in advertisements. Companies call a product "new and improved" when they've created a new version of something or made improvements to it. You will often see "New and Improved!" written on a product's package.

Because this phrase is associated with advertisements, you wouldn't call something "new and improved" in a conversation with your friends unless you were making joke by pretending to be in a commercial.