This is a collaborative website, under a free license (CC BY-SA 4.0), completely free, without ads, that hosts definitions of words written by and for young people aged 10 to 15. The definitions are simple - without words that would require other definitions - and with suitable examples. In short, it's the little brother of Wiktionary. Like the latter, being wiki-based, anyone can improve/enhance/correct the pages of this online dictionary, even without creating an account.