%s

%s may refer to:

C string

 * , in printf format string
 * , in scanf format string

System time

 * , seconds in the strftime format string
 * , used to check the Unix timestamp

Web browsers and websites

 * a marker in a smart bookmark showing where to insert an argument string
 * a marker in setting 'site search shortcuts' (in the "URL with %s in place of query" field) for Opera and Chromium-based browsers