RollQuest summary of the SRD 5.1 rules, not a quotation.
Channel divine energy directly from your deity or oath to fuel magical effects. When you use your Channel Divinity, you choose which effect to create: a cleric chooses Turn Undead or an effect determined by their domain; a paladin chooses an option granted by their oath. You must then finish a short or long rest to use your Channel Divinity again; when you finish a short or long rest, you regain all expended uses. Some Channel Divinity effects require saving throws; when you use such an effect from this class, the DC equals your spell save DC.
SRD 5.1, p.16 · CC BY 4.0
Run it, don’t just read it
RollQuest ships the D&D 2014 SRD as a content pack, on a 5e character sheet that does the maths - roll from the sheet and let the numbers work themselves out. Free to start.