Polylactide (PLA) is a thermoplastic aliphatic polyester that is derived from renewable resources such as cornstarch, sugarcane, and other annually renewable biomass products and wastes. PLA is the most well-developed commercially available biopolymer that was firstly commercialized via ring-opening polymerization by Cargill Inc. in 1992. Being a biobased polymer, PLA is also biodegradable and biocompatible that opens a horizon for its usage in various and wide range of applications from commodity to biomedical areas. Despite these features, PLA possesses several drawbacks that limit its applications. These shortcomings could be named as low melt strength, slow crystallization kinetics, poor processability, formability, and foamability, and eventually brittleness, low toughness, and low survival temperature. Therefore, a lot of research has been devoted on obtaining breakthroughs to overcome these drawbacks and, in this context, development PLA's foams has been one of the vast attempts on this research road.