The term hasbara is not a word that can properly be translated to English. However, its approximate meaning would be "explaining."
In its context of use, hasbara essentially refers to Israeli public diplomacy, explaining Israel and Israel's actions in a way that puts the Jewish state in a positive light.
Hasbara is an important part of Israel's efforts to combat widespread delegitimization efforts against it, such as the BDS movement and the public diplomacy efforts of entities hostile to the Jewish state.