As explained by the TV Licence's official website, all UK households require a licence if they wish to watch or record programmes on a TV as and when they are broadcast. This includes all stations including the BBC, Channel 4, Channel 5, ITV and many more.
People also require a TV licence if they watch or steam programmes live via an online TV service on any device including tablets, gaming consoles, laptops and mobile phones.
Examples of these include the BBC iPlayer, ITV Hub, All 4, Amazon Prime Video, Now TV and Sky Go to name a few.