令和4年度 ITパスポート試験問63

This question's explanation and your answers so far.

問63

頻出度★☆☆

スマートフォンやタブレットなどの携帯端末に用いられている，OSS (Open Source Software) である OS はどれか。

出典　令和4年度 ITパスポート試験問63

解説

問 63

ア
正解 The OS that is widely used on mobile devices such as smartphones and tablets and is also OSS (Open Source Software) is choice ア, Android. Android is developed mainly by Google and is built as AOSP (Android Open Source Project) on top of the Linux kernel, so its source code is publicly available and reusable, satisfying the OSS condition. Android is the only choice that meets both conditions at once: being a mobile-device OS and being OSS.
Incorrectイ
iOS is Apple's OS for the iPhone and iPad. Although it is a mobile-device OS, it is proprietary software (source code not disclosed) owned by Apple and is not OSS, so it is incorrect.
Incorrectウ
Safari is Apple's web browser and is not an OS at all. It does not meet the condition of being an OS used on mobile devices, so it is incorrect.
Incorrectエ
Windows is Microsoft's OS, mainly for PCs, and is proprietary software owned by Microsoft, not OSS. In addition, it is not a representative mobile-device OS as assumed by the question, so it is incorrect.

ここがポイント

OSS (Open Source Software) refers to software whose source code is publicly available and can be freely used, modified, and redistributed. Android is an OSS OS based on the Linux kernel.
The key point is being able to distinguish the categories: iOS and Windows are proprietary OSes owned by their vendors, while Safari is not an OS but a browser.

用語

解答問63ア