Recommerce or reverse commerce, is the selling of previously owned, new or used products, mainly electronic devices or media such as books, through physical or online distribution channels to buyers who repair, if necessary, then reuse, recycle or resell them. Recommerce allows for the item to have a second life with a new owner instead for it to be thrown out and left to be forgotten.

In February 2005, George F. Colony, the head of Forrester Research introduced the term recommerce in response to a question about the technology spending trends after the Dot-com bubble: "There's a lot of shelf-life issues out there. People are a couple of releases behind. Older PCs. There is a move to really go back to — we call it 'recommerce'. Instead of 'ecommerce', it's 'recommerce'". He said.

The term is now primarily used to describe businesses that resell used goods. Most of them focus on consumer electronics, such as smartphones, tablets, and notebooks. Physical media, such as books, DVDs, and Blu-ray discs are also significant.

While there have long been channels for selling used goods, such as garage sales and flea markets, online platforms such as eBay or craigslist allow individuals to sell used goods much more efficiently.

Beginning in the early 2000s, companies that professionalized the industry by offering professional buyback or trade-in schemes started to thrive: consumers could sell their old smartphones, TVs, or computers to offset the cost of a new one. This has been common practice with car sales for decades.

Companies such as Gazelle, Rebag, and ThredUp started in the 2000s to offer purchasing and trade-in services completely separate from the purchase of new items and further spread the term. Soon after this, companies like SmartphonesPLUS, Amazon, and Walmart started their own trade-in programs.

Consumers who sell used goods directly person to person (such as flea markets, garage sales or ad hoc) or via Marketplaces such as Amazon or eBay. Hereby some platforms such as eBay may hedge the risk of the payment for the consumer by providing payment tools such as PayPal or just offer the possibility to market the product such as craigslist. This method allows for users to give items like clothes a second chance in life and help to not contribute towards fast fashion or let clothes go to waste.

An increasing amount of transactions occur directly via specialized service companies that purchase used goods, refurbish them if necessary and resell them subsequently. Such platforms often provide initial indications of the final purchase price for the good.