Leveling in Dragon Age: Inquisition is very similar to other RPG games. Once you obtain the required amount of experience points, your character is automatically promoted to the next level. What this means is that, first of all, the main statistics of your character are raised and your health bar is extended. Apart from that, you receive an ability point. I recommend that, each time you gain the next experience level, you access the character window to spend that point.
Note! Each character has a separate experience bar. This means that they are promoted to the next level independently of each other, not always at the same time.
Note! I recommend that you see the page entitled How to level-up fast? in the Questions and Answers chapter. There, you can find a number of hints on how to obtain experience points faster.
Leveling-up is very important when it comes to progressing in-game. The characters that are not developed well enough will have problems defeating stronger monsters or completing some of the quests. In the case of the storyline quests, the game sometimes offers you an additional hint, e.g. it suggests the experience level, at which your characters should be, to be able to complete that quest. An example of such a quest has been presented in the above screenshot - the recommended experience ranges between levels 8-11. This means that if your party experience is lower than 8, you may have serious problems completing that quest. On the other hand, a party with the level higher than 11 should have no problems with completing it.
Note! Information about the recommended level for some storyline quests has been provided in the walkthrough for the game.