What is the difference between the "passé composé" and the "imparfait"?

The passé composé and the imparfait are difficult for English speakers, as they do not translate directly into English.The passeé composé is used for completed actions in the past, while the imperfect is used for repeated or habitual actions, descriptions, and conditions.Imagine a selfie of a girl in front of the Eiffel Tower, with the focus on the girl.To describe the actions of the girl i the photo, we would use the passé composé. "Elle a pris un photo avec son portable. Elle a souri. Elle est allé au tour Eiffel pour prendre le photo." Here we are using the passé composé as we are talking about completed actions in the past at a certain point in time. So, to depict the background, physical descriptions, what is occurring around her, ongoing actions and habits, we use the imperfect. Il faisait beau. Elle portait un robe. Elle était contente. Elle allait souvent à la Tour Eiffel souvent quand elle était enfant. (The weather was good. She was wearing a dress. She was happy. She often went to the Eiffel Tower as a child.) You may find them together in a sentence:e.g. Il faisait beau, donc ils sont allés à la plage. (The weather was good [description in past], so they went to the beach.[completed action in the past]) e.g.2. Il devenait désésperé, et il m'a supplié. (He became/was getting desperate [action over time], and he begged me [completed action at certain time.]e.g.3. Il dansait, mais il est arrêté quand il s'est blessé à la cheville. (He used to dance [habitual action], but he stopped (sudden action completed in past] when he injured his ankle [completed action at certain point in past]. As you can see from this example, the passé composé can 'interrupt' an ongoing action described in the imparfait.