A 'call for papers' is an announcement, usually made by a conference organizer, seeking submissions of abstracts or research papers. The announcement will include details on the submission process as well as deadlines and any specific requirements for formatting or topic.
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Calls for papers are also made by journals in order to fill their pages. In this case, the journal will have its own guidelines for submissions which must be followed in order for your paper to be considered. The paper itself may go through a peer-review process before being accepted or rejected for publication.
If you are thinking of submitting a paper to either a conference or journal, keep an eye out for calls for papers that align with your interests and expertise. It is important to read the announcement carefully in order to ensure that your submission meets all the necessary requirements.