Which term represents an online representation of a user?

The term that best represents an online representation of a user is "Avatar." An avatar typically refers to a graphical representation or icon that can embody a user within a digital space. This can include anything from a simple icon to a detailed 3D model, often used in various online environments such as gaming, social media, and virtual worlds.

While the term "Profile" relates closely to a user’s presence online, as it contains information about the user and often includes an avatar, it does not specifically refer to the visual representation itself. "Image" is too broad and lacks the context of being a user representation; it could refer to any visual file, not necessarily linked to a specific user. "Identity" refers more to the overall persona or character that a user presents online, encompassing beliefs, interests, and interactions, but again does not specifically denote a visual representation.

In summary, "Avatar" distinctly captures the concept of a visual representation of a user within digital platforms, making it the most precise choice in this context.