Why do “flammable” and “inflammable” mean the same thing, or is there a difference?

Question

Edit: SERIOUSLY, THANK YOU—

BTW my confusions stems from them having the same meaning online

Flammable: “easily set on fire”
Inflammable: “easily set on fire”

Definitions from Oxford Languages

In: Other

Answer 1

“‘Inflammable’ has always meant ‘tends to catch fire easily’; but, because the prefix ‘in-‘ often means ‘not’ (as in ‘ineffective’) and for that reason ‘inflammable’ might be misinterpreted, ‘flammable’ has become the preferred alternative on warning labels. ‘Nonflammable’ is the antonym.”

Source: [https://www.theguardian.com/notesandqueries/query/0,,-78567,00.html](https://www.theguardian.com/notesandqueries/query/0,,-78567,00.html)