24/7 是一天24小时，一星期7天的缩写，即全天候提供服务年终无休的意思。

在商业和工业领域里，通常是指所提供的不间断的服务，即不管任何时候，白天或黑夜，都营业。这样的服务一般都能在超级市场、自动提款机、汽油站、餐馆、赌场、酒店、便利店和政府的警察部门等见到。

在实际生活中，不断加大的压力和日益严峻的经济环境压得人民喘不过气来。24/7可以用于形容、夸张。 用法示例："The government seems to think that anyone in business has big profits, so they make us pay big taxes." he explains wearly. "I work 24/7 to see my profits reduced to peanuts."

In commerce and industry, 24/7 or 24-7 service (usually spoken "twenty-four seven") is service that is available any time and, usually, every day. Alternate orthography for the numerical part includes 24x7 (usually spoken "twenty-four by seven"). The numerals stand for "24 hours a day, 7 days a week". Less commonly used, 24/7/52 (adding "52 weeks") and 24/7/365 service (adding "365 days") make clear that service is available every day of the year.