A strain is an injury to a muscle whereas sprain is an injury to a tendon in which the muscle fibers tear as a result of overstretching. A strain is also colloquially known as a pulled muscle. The equivalent injury to a ligament is a sprain.
This page contains content from the copyrighted Wikipedia article "Strain (injury)"; that content is used under the GNU Free Documentation License (GFDL). You may redistribute it, verbatim or modified, providing that you comply with the terms of the GFDL.