The phrases AT THE END and IN THE END are very similar in English.
Use at the end for time phrases and location. For example: At the end of the year, the workers get a Christmas bonus. 2.We did some English exercises at the end of the lesson. 3. At the end of the show, the actors left the stage. 4. The hospital is at the end of the street.
Note the idiomatic expression at the end of the day is often used to mean ultimately or finally. Example: We’re trying many different types of advertising for the company but at the end of the day, we will need to decide which type works best. 2. It might be a good idea to open the shop on Sundays. Despite the additional costs of labour, at the end of the day we might increase our sales.
Use in the end to mean finally or to conclude a situation. For example: They were always fighting. I can’t believe they got married in the end! 2. We couldn’t find an apartment that we liked in the city so we moved to the suburbs in the end.