Describes tasks, problems, or matters that are not difficult or burdensome. Somewhat formal and less common in everyday speech than 簡単 or 容易.
This task is easy, so it will probably be finished quickly.
I decided to start with the simple problems.
Standard kanji spelling; the word is not especially common but the kanji are straightforward.
Compound of 軽 (light, easy) and 易 (easy, simple). The exact historical derivation is uncertain, but the meaning follows directly from the kanji.