As one of the central couples in That '70s Show, Eric Forman and Donna Pinciotti's relationship is a main focal point from the very beginning of the show. Set in the 1970s, That '70s Show is a teen sitcom about a teenager named Eric Forman and his friends, who spend most of their time hanging out in Eric's basement, much to his mom Kitty's delight and his dad Red's dismay. Donna is Eric's longtime best friend and next-door neighbor, who becomes his on-and-off girlfriend.

https://screenrant.com/that-70s-show-donna-eric-relationship-timeline/