Standard electricity supply is 110V/60Hz. The sockets are for 2 flat prongs, the same as in the USA. Use a surge protector for your expensive equipment. An international plug with a USB-hub is useful, maybe combined with a multiple plug if you use lots of electronics.
In Colombia the power plugs and sockets are of type A and B. The standard voltage is 110 V and the standard frequency is 60 Hz.
If the standard voltage in your country is in the range of 220 – 240 V (as is in the UK, Europe, Asia, Africa and Australia), you need a voltage converter in Colombia. Some say you can carefully try to use your appliances in Colombia without a converter. Most likely they won’t be damaged, but may not function optimally. If you don’t want to take any chances, use a converter. You can also consider a combined power plug adapter/voltage converter.
In Peru the power plugs and electricity sockets are of type A and C. The standard voltage is 220 V and the standard frequency is 60 Hz.
If the frequency in Peru differs from the one in your country, it is not advised to use your appliances. But if there is no voltage difference, you could (at your own risk) try to use the appliance for a short time. Be especially careful with moving, rotating and time related appliances like clocks, shavers or electric fan heaters.