Most new mobile devices come with a faster type C output charger while most of your cables will still be USB A input. Also your new device might come with a type C input cable but most public places only use USB A output ports.
To solve this issue take this 2 pcs adapter set wherever you go so you don’t have to buy new cables or look for new adapters. Content: 1 USB A to USB C adapter and one USB C to USB A adapter. Adapter material: aluminium