Used especially in computing and technical contexts for a thorough, step-by-step description.
A detailed explanation of this function is on page 10 of the manual.
エラーメッセージの詳細説明を読んでください。
Please read the detailed explanation of the error message.
説明 is a general explanation, while 詳細説明 emphasizes thoroughness and detail.
詳細 means 'details' or 'detailed information' as a noun or adjective, whereas 詳細説明 is specifically a detailed explanation.
Compound of 詳細 (detailed) and 説明 (explanation).