A web proxy lets you browse the web indirectly.
It is especially useful in situations where a specific resource, webpage or domain may be blocked from your network. This could be because your office network, ISP or firewall is set to block access to popular web sites they don't want you to access or sometimes a configuration error.
A web proxy works because instead of accessing the blocked content directly, it instead fetches your request for you. This lets you access blocked or restricted sites indirectly.
For example, one option is this web proxy.
So the next time you find yourself unable to access a particular web site, simply use a web proxy.
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