Hi Anand,
Thank you for posting your query.
Kindly check the information below to answer your query.
Microsoft Defender for Endpoint Plan 1:
Microsoft Defender for Endpoint is an enterprise endpoint security platform designed to help organizations like yours to prevent, detect, investigate, and respond to advanced threats. We are pleased to announce that Defender for Endpoint is now available in two plans:
Defender for Endpoint Plan 1, described in this article; and
Defender for Endpoint Plan 2, generally available, and formerly known as Defender for Endpoint.
Go to this link for your reference https://learn.microsoft.com/en-us/microsoft-365/security/defender-endpoint/defender-endpoint-plan-1?view=o365-worldwide
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