In the simplest terms, business alignment is twofold. First, there is the cultural aspect wherein every employee at all levels of your company subscribes to and promotes your core values and mission statement. Second, there is a procedural component wherein everyone within the business understands the interconnectedness of their work.
The overall theme of business alignment is togetherness and the reason why is not surprising: when our goals and values are shared and our individual work has a clear impact, we are better able to collaborate towards success.
Often, the term organizational alignment is thought of as existing between leadership and employees or between IT and non-tech departments. The reality is that true organizational alignment must exist between all possible combinations of departments and individuals, so that each one's work is both informed by and contributes to the others'.