This article provides an overview of the relationship between Computer Assisted Language Learning (CALL) and Second Language Acquisition (SLA) and how CALL practices can be informed and supported by SLA theories. To illustrate how CALL research has drawn on SLA research, a theoretical discussion of CALL theory and approaches and their underpinning principles in SLA is crucial. Research has proven the effectiveness of educational technologies in language learning. Therefore, it has become mandatory that the effectiveness of educational technologies should be blended with SLA insights about language and language learning to create theoretically and pedagogically sound CALL projects. Moreover, research in CALL, as a relatively new field, should make use of approaches and methods used in SLA research to investigate the questions of interest.