OpenAI announced a big upgrade for ChatGPT a few months ago. The chatbot would be able to retain memories from your conversations with it. This happens in two ways: You can tell ChatGPT to remember specific things about yourself or let it pick up details from chats and remember them later.
The ChatGPT conversation memory feature builds on the custom instructions that OpenAI previously enabled in ChatGPT. The latter lets you instruct ChatGPT on how to answer your prompts and also offers the chatbot context about yourself.