一般用在广告行业里，线上项目，线下项目还有就是基本线，这个line主要是指项目的预算。atl是覆盖性的宣传策略，不管是否覆盖到非目标客户群，比如电视广告，网页广告。btl就是针对性的宣传，比如邮件，派传单，都是直接针对所指定的人。
BTL stands for:“Below the Line” marketing, which is a more targeted and direct approach to marketing. BTL marketing activities include promotional events, direct mail campaigns, and targeted advertising. TTL stands for:“Through the Line” marketing, which combines the above two methods. It invo...
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