Difference between createUser and signUp? (node-postgres)

[Ahmedhossamdev]

  public createUser = async (req: Request, res: Response, next: NextFunction): Promise<void> => {
    try {
      const userData: User = req.body;
      const createUserData: User = await this.user.createUser(userData);

      res.status(201).json({ data: createUserData, message: 'created' });
    }
    catch (error) {
      next(error);
    }
  };