Everything you do on a host can be done from the control panel: uploading files, creating databases, installing WordPress, setting up email. For the vast majority of sites, that is more than enough. But a slice of users, developers especially, eventually need something the graphical panel does not offer with the same speed: a terminal.
That access is called SSH, and it is worth understanding what it is, what it is genuinely used for, and what its limits are on a shared plan.
What SSH is, without the jargon
SSH is a protocol that lets you connect to the server through the command line instead of through the browser. Instead of clicking through the panel, you type text instructions that the server runs directly.
It is the same difference as running a program with the mouse versus using keyboard shortcuts: the end result can be identical, but for someone who already knows how, the terminal is far faster for repetitive or specific tasks.
What it is used for in practice
The real use cases, not the theoretical ones, are fairly concrete.
Installing a project's dependencies. If you work with development tools that build the site from source code, you need to run those installation commands on the server.
Moving large files quickly. Uploading a folder with thousands of files over FTP can take a long time. Over the terminal, compressing at the source, uploading one single file and decompressing at the destination is noticeably faster.
Working with version control. If the project is managed with a version control system, it is common to pull changes straight onto the server from the terminal instead of uploading file by file.
Diagnosing specific problems. Searching for a specific string across thousands of files, checking which processes are running, or inspecting file permissions in detail is more direct from the terminal than browsing folder by folder in the file manager.
Automating tasks with scripts. Any process that repeats (a backup, a cleanup, a sync) can be scripted and run with a single command, instead of repeating the same clicks every time.
Its limits on a shared plan
This is the part worth being clear on so it does not come as a surprise. On shared hosting, where terminal access is available at all, it comes with deliberate restrictions, because the server is shared by dozens or hundreds of different accounts.
Access is usually confined to your own file folder, with no way to see or touch anything from other accounts. You cannot install software at the operating system level, change settings that affect the whole server, or open your own network ports. It is a terminal for working with your files, not for administering the machine.
That limitation is not arbitrary: it is what lets a shared plan be secure and affordable at the same time. If one user could do anything at the system level, everyone else's security on that server would be at risk.
If your plan does not show the option in the panel, many providers will enable it on request through support, evaluating it against what you intend to use it for.
When it stops being enough and a VPS makes sense
There is a point where shared hosting's limitations stop being a minor annoyance and become a real obstacle to your work. The clearest signs: you need to install a system component shared hosting does not allow, you need to open your own port for a service, or you need full control over server configuration rather than just your files.
That is where a VPS makes sense. The key difference is that on a VPS, terminal access comes without shared hosting's restrictions: you can install whatever you need at the system level, because the server (virtual, but isolated) is genuinely yours. The trade-off is that you become responsible for administering it: system security updates, web server configuration, everything shared hosting's provider handles for you.
For most projects, even technical ones, shared hosting with limited SSH is enough. The jump to a VPS makes sense when the need is specific and concrete, not "just in case".
Good practices if you are going to use it
Use a key instead of a password to connect, if your provider allows it. It is more secure and avoids the risk of a weak or reused password, which is the most common way in for a brute force attack against this kind of access.
Do not leave the connection open on a computer that is not yours or on an unsecured public network, because whoever has that active session has the same access you do. And if you work with a team, give each person their own key instead of sharing one: that way, if someone leaves the project, only their access gets revoked instead of having to change the key for everyone.
Finally, close the session when you finish instead of leaving the terminal open in the background. It sounds obvious, but it is the same habit as locking your computer when you step away, and it is the detail people forget most often once the connection stops feeling new.