convenient; handy; useful — indicating something is easy to use or suits one's needs (na-adjective).
スマホがあれば地図を見るのにとても便利だ。
With a smartphone, it's very convenient to look at maps.
このツールは操作が簡単で便利さが魅力だ。
This tool's ease of use and convenience are its attraction.
駅から近くて便利な場所に引っ越したい。
I want to move to a convenient location close to the station.