"My NCBI is a tool that retains user information and database preferences to provide customized services for many NCBI databases. It allows you to save searches, select display formats, filtering options, and set up automatic searches that are sent by e-mail. My NCBI includes other features that help you save your citations and manage peer reviewed article compliance with the NIH Public Access Policy (My Bibliography), and create an online professional profile (SciENcv)." (copied from the MyNCBI help page).