What kind of industry is telemarketing?

Telemarketing is the lowest level of sales work. For the boss, 99% of telemarketers can be replaced at any time. It doesn't matter who leaves. It is almost impossible for telemarketers to accumulate contacts. If you are interested in accumulating, your accumulation will be basically invalid after being fired. Generally speaking, telemarketing is the lowest cannon fodder, which is insignificant. The boss hired you to be cannon fodder, and the focus of his work is the preliminary investigation and classification of massive data.