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 & Email signature marketing What is TTL Marketing? To sum it all up Short answer What are the definitions for ATL, BTL, and TTL marketing ATL stands for:“Above the Line” marketing, which refers to a form of marketing that targets a wide audience through mass media such as television...
Marketing activities (basically advertisements) today can be divided into three segments – Above the Line (ATL), Below the Line (BTL), & Through the Line (TTL) marketing. The line was originally used to separate marketing activities which had mass penetration (above the line) to those which ...