Definition
AI memory is AI memory is a feature that saves details from your past conversations, such as preferences and facts about you, and brings them back into later chats so you do not have to repeat yourself.
AI memory is the ability of a chatbot or agent to remember things between conversations. Without it, a model starts every chat blank: it knows only what is in the current context window. With memory, the product saves selected details and supplies them again when they are relevant.
The model's learned knowledge, stored in its weights, does not change when you chat with it. Memory is usually a layer built around the model. The product stores notes, such as "prefers short answers" or "works in healthcare marketing," and inserts the relevant ones into the model's input at the start of a new conversation. The model then behaves as if it remembered, because the information is right there in front of it.
That makes memory a close cousin of context engineering: someone has to decide what to save, what to retrieve and what to leave out.
Because retrieval is a guess about what is relevant, memory can miss something you wanted or bring up something stale.
Memory saves repetition and makes an assistant feel personal. For an AI agent that works over days or weeks, it lets progress and decisions carry across sessions instead of vanishing when a chat ends.
It also raises questions worth asking before you trust it with sensitive material:
Read the provider's terms, because the answers differ from product to product.
You tell an assistant once that you write for beginners and want American spelling. Weeks later you ask for a draft in a fresh chat. With memory, the draft arrives in that style. Without it, you would paste the same instructions again.
Keep memory entries short and factual. Review them occasionally, since an outdated note can quietly steer answers the wrong way. Turn memory off, or use a temporary chat, when you are working with information you would not want stored.
Generally no. Memory stores notes outside the model and adds the relevant ones to the prompt, so the model's weights stay the same.
Most products let you view and delete saved memories, but controls vary, so check the provider's settings and terms.
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