Dynamical decoupling (DD) is an open-loop method for decoherence reduction based on the frequent application of strong pulses, designed to cancel terms in the system-bath interaction Hamiltonian. DD has been tested and successfully implemented in numerous experimental systems. After introducing the basics of DD, this tutorial will review recent developments concerning optimized pulse sequences, capable of canceling the system-bath interaction to arbitrary given order. The integration of DD with computation will also be addressed, from the complementary perspectives of "decouple while compute" and "decouple then compute". The former requires a commuting set of pulses and gates, which can be designed using tools borrowed from quantum error correction. The latter allows DD to be integrated with fault tolerant quantum computation.