As others have said, if you have a wireless router, you can buy a wireless adapter for your computing device. This could be a USB dongle costing from around £5 ($7) or a plug-in wireless circuit board that plugs into a spare socket inside a PC. These things are made to comply with international standards. Anything calling itself '802.11 a, b or g' will work but be slow. 802.11n devices are faster and the signal goes further. The latest 802.11 ac adapters are supposed to be even faster - but only if your router also uses that protocol. They are all backwards compatible so its a good idea to buy the fastest you can afford. Even cheap ones can be fast.
If your router does not have wireless capability, there is another option though it may not be available in every country. It uses devices that provide an internet connection through the mains wiring of your home. You have two plug-in boxes, one near your router and one somewhere else. You connect one to the router using a short ethernet cable. You can use another ethernet cable to connect your computing device to the remote box. Hey presto .. you have internet access away from your router.
It gets better, because you can buy sets of these devices where one of them creates its own wireless hot spot so you can connect wirelessly to the remote device and it connects back to the other box through your house wiring and on through its ethernet cable to your router. This is the set-up I use to provide internet access anywhere in my large garden which is WAY beyond the reach of my indoor wireless access.
So, lots of options and the cheapest is very likely to work.
Here's a link to the sort of thing I'm talking about:
http://www.broadbandbuyer.com/store/homeplug-powerline/homeplug-wifi/
and here's a link to various wireless dongles:
https://www.amazon.co.uk/s/ref=nb_sb_ss_i_1_15/254-1849563-2981648?url=search-alias%3Dcomputers&field-keywords=wireless+dongle&sprefix=undefined%2Ccomputers%2C203