Suppose there’s a scenario where in one trigger perform update operation, which results in invocation of second trigger and the update operation in second trigger acts as triggering criteria for trigger one. In that case there will be a recursion and than will be Apex Governor Limits Errors .. bla .. ala .. bla ….

Following are two articles which helps to control or regulate the execution of multiple triggers and prevent recursion.

http://www.tehnrd.com/apex-flow-control-preventing-infinite-loops/

http://blog.jeffdouglas.com/2009/10/02/preventing-recursive-future-method-calls-in-salesforce/