Internet service provider (ISP)
Also known as: ISP, internet provider, internet service providers, broadband provider
An internet service provider (ISP) is a company that connects homes and businesses to the internet, using technologies such as fibre, cable, DSL, fixed wireless, cellular, or satellite.
ISPs supply the line, often the modem or router, and the connection to the wider internet. In Canada, a few large companies own most networks, while smaller independent ISPs rent access under rules set by the CRTC, which is a big reason prices and competition are constant political topics.
Internet service provider (ISP), explained at three levels
At home
An ISP is like your water utility. The utility runs pipes from a big reservoir to your tap, and you pay monthly for the supply. Your ISP runs a fibre, cable, or phone line to your home, installs a modem that translates its signals, and connects your house to its own network. That network links to other networks, which together make up the internet.
At work
An internet service provider sells connectivity: the physical line into the building, a public IP address, and a route from its network to the rest of the internet. For a business, the ISP is a critical supplier. Its uptime, repair speed, and upload capacity directly limit cloud apps, video calls, and phone systems, so an outage at the ISP can halt work across the whole office.
At home
Your connection has a few parts. The access network is the last stretch to your home: fibre, a coaxial cable using DOCSIS, an old copper phone line using DSL, or a wireless signal. It ends at a modem or optical terminal. Inside the ISP, routers send your traffic onward, and the ISP connects to other networks by buying transit or swapping traffic at exchange points. Your real speed depends on the access technology, how busy the shared network is, and your home Wi-Fi.
At work
ISPs sell two broad kinds of business service. Shared broadband, such as cable or fibre-to-the-premises, is cheap but best effort, so speeds dip at busy times and repairs follow residential queues. Dedicated internet access is a circuit reserved for one customer, with symmetrical speeds, static IP addresses, and a service level agreement promising uptime and repair times. Many businesses combine both, with a router or SD-WAN device that fails over between two providers on different technologies.
At home
In Canada, a handful of incumbents such as Bell, Rogers, and Telus own most last-mile networks. Independent ISPs rent access to those lines under CRTC wholesale rules and handle their own billing and support, so the same cable can carry two companies' service. While independents often cost less, they depend on the incumbent for repairs and on wholesale rates the CRTC sets. In my opinion, they are worth comparing, but check how their support handles outages.
At work
Behind the sales sheet, ISP quality comes down to network design. An ISP's peering and transit relationships decide how many hops your traffic takes to Microsoft 365, AWS, or a payment processor. Path diversity matters because two 'different' providers may share the same conduit or central office, so one backhoe can cut both. SLAs usually pay small credits, not real losses. When choosing providers, ask for route maps, peering at local exchanges such as TorIX, and the actual repair commitments.
Real-world examples
At home
Sophie switched from a big ISP to a smaller independent provider in Kitchener, using the same cable lines. Her bill dropped by a third, with similar speeds.
At work
Jerome runs IT for a law firm in Montreal. After a fibre cut caused a day-long outage, he added a second ISP using a different technology and physical route into the building.
How it compares
| feature | Large incumbent ISP | Independent ISP |
|---|---|---|
| Network ownership | Owns its network | Often rents access |
| Price | Usually higher | Often lower |
| Bundles | TV, mobile, home phone | Fewer |
| Outage repairs | Directly controls the network | Depends on the network owner |
Incumbents control the wires. Independents compete on price and service.
For analysts
For business-critical sites, I'd buy internet from two providers using different technologies and physical paths. A cheap second line is the most effective uptime insurance around.
History & origin
Universities and governments ran the early internet. The World, based in Massachusetts, is often cited as the first commercial dial-up ISP in 1989. In Canada, early commercial ISPs appeared in the early 1990s, alongside community networks called FreeNets. Broadband arrived through cable and DSL in the late 1990s. The CRTC declared broadband a basic telecommunications service in December 2016, setting a target of 50 Mbps download and 10 Mbps upload for all Canadians. In 2024 and 2025, the CRTC required large phone companies to give competitors wholesale access to their existing fibre networks, a decision the federal government upheld in August 2025, while Bell said it would slow its fibre expansion. In my view, Canada's ISP market shows how much internet quality depends on policy, not just technology.