Amazon Rekognition is an AWS service that uses deep learning technology to analyze images and videos. Its primary functions include:

1. Object and scene detection - Identifying objects, people, text, scenes, and activities
2. Facial analysis - Detecting faces, analyzing facial attributes (emotions, age range, gender)
3. Face comparison - Comparing faces for similarity
4. Content moderation - Detecting inappropriate or unsafe content

Why other options are incorrect:

• A (Converting speech into text): This is the function of Amazon Transcribe
• C (Translating text between languages): This is the function of Amazon Translate
• D (Generating natural-sounding speech): This is the function of Amazon Polly

Amazon Rekognition is part of AWS's AI/ML services and is commonly used for applications like content moderation, facial recognition, image analysis, and video analysis.