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Among different categories of microgrids, i.e. AC, DC, and hybrid, extensive research has been conducted on operations and control of AC microgrids. DC microgrids could, however, offer several advantages compared to AC microgrids by providing a more efficient supply of DC loads, reducing losses due to the reduction of multiple converters used for DC loads, allowing easier integration of DC DERs, and eliminating the need for synchronizing generators. In this chapter, different components of AC, DC, and hybrid AC/DC microgrids were explained, followed by developing a microgrid planning model for determining the optimal size and the generation mix of distributed energy resources (DERs) as well as the microgrid type, i.e. AC or DC. Considering the growing ratio of DC loads and DERs, DC microgrids can be potentially more beneficial than AC microgrids by avoiding the need to synchronize generators …