遥远 (yáoyuǎn) means 'distant' or 'far away' and describes great physical or temporal distance. It is more literary and expressive than simply saying 远, and is often used to evoke a sense of vastness or unreachability.
他离开家乡去了一个遥远的城市工作。
Tā líkāi jiāxiāng qù le yī gè yáoyuǎn de chéngshì gōngzuò.
He left his hometown to work in a distant city.
那些遥远的星星其实是巨大的恒星。
Nàxiē yáoyuǎn de xīngxing qíshí shì jùdà de héngxīng.
Those distant stars are actually enormous fixed stars.
童年的记忆虽然遥远,却依然清晰。
Tóngnián de jìyì suīrán yáoyuǎn, què yīrán qīngxī.
Although childhood memories are distant, they remain vivid.