"Can I" is a phrase often used to ask for permission or to inquire about the possibility of doing something. It reflects a desire to understand whether an action is allowed or feasible. For example, someone might say, "Can I borrow your book?" to seek permission from the owner. In addition to permission, "Can I" can also express capability. For instance, a person might ask, "Can I swim?" to determine if they have the ability to swim. This usage highlights the distinction between seeking permission and assessing one's own skills or potential.