Opposition to slavery refers to the movements and ideologies that actively resisted and sought to abolish the institution of slavery, which was prevalent in many societies, particularly during the transatlantic slave trade. This opposition included a variety of efforts such as abolitionist movements, legal challenges, and grassroots activism, reflecting a growing moral and political consciousness against the inhumanity of slavery. These efforts were vital in shaping public opinion and eventually led to significant legislative changes aimed at ending slavery.