Upselling is the act of persuading a customer who is already making a purchase to switch their lower tier choice for a more premium option.
Upselling is a common sales tactic in both B2C and B2B marketing. Upselling is similar to cross-selling, which is when a salesperson persuades a customer to add additional complementary products to their purchase.

In B2B SaaS, this might be a longer subscription, or a more premium package that offers additional features or add-ons. In partnerships, your ecosystem partners can upsell or cross-sell your SaaS product to their existing customers as an effective marketing technique. Upselling is particularly effective when two SaaS companies partner together to offer a more inclusive service package of their complementary products.