3,4-Furandicarboxylic acid serves as a building block in the synthesis of bio-based polymers, including furan-containing polyesters and polyamides from renewable feedstocks. Its rigid furan ring imparts high thermal stability and mechanical strength to the resulting materials. It is used in developing sustainable plastics for packaging, fibers, and engineering applications. Additionally, it is investigated for metal-organic frameworks (MOFs) due to its metal-chelating properties, enabling applications in gas storage, separation, and catalysis.