These are more secure techniques for positively identifying the source of a request, and additionally, for protecting the request's content from snooping (in addition to tampering).
In general, if you have both a public and a private API key, then it suggests that the keys are themselves a traditional public/private key pair used in some form of asymmetric cryptography, or related, digital signing. Further still, by blocking a key, you can partially prevent abuse in the case of too-high request volumes. For companies which make money from selling such services, it's also a way of tracking who's using the thing for billing purposes. For example, you can restrict access to certain API actions based on who's performing the request. Typically, if you can identify the source of a request positively, it acts as a form of authentication, which can lead to access control.
The key may be included in some digest of the request content to further verify the origin and to prevent tampering with the values. Sobolsoft api key how to English To Hindi and Hindi To English Converter Software way to uninstall English To Hindi and Hindi To English Converter Software from your computerYou can find on this page detailed information on how to remove English To Hindi and Hindi To English Converter Software for Windows. By and large, however, an API key is the name given to some form of secret token which is submitted alongside web service (or similar) requests in order to identify the origin of the request. What "exactly" an API key is used for depends very much on who issues it, and what services it's being used for.
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