How is DVT treated?

People around Tinley Park who read about clots in the leg and clots in the lung often assume the treatment question has one answer. This page keeps to deep vein thrombosis and sets the lung look-alike off to the side.
The aim, in the publisher's words
my.clevelandclinic.org states the purpose plainly: DVT treatment aims to keep the clot from getting bigger or breaking off and lessen the risk of another blood clot.
Reading the treatment sources side by side
Two publishers cover this ground separately. The Cleveland Clinic page on deep vein thrombosis gives the sentence above, while the NHLBI treatment page for venous thromboembolism comes from a different institution and is best read as its own account rather than a copy of the first.
The wider venous picture
Cleveland Clinic's venous disease overview gives the wider venous background for deep vein thrombosis.
The question that follows
The lung look-alike has its own page on this site, so the natural next question is what a pulmonary embolism is.