Quick meaning
Using your existing social media account (like Facebook or Google) to log in to a different app or website.
Think of it like this
Like using your company ID card to access a partner building.
Where you may see this
You may see this on Facebook, Instagram, TikTok, WhatsApp groups, and other social apps.
Why it matters
Understanding the term helps you use social platforms more comfortably and spot risky or misleading behaviour.
Say it simply
Sign in with Social Media means: Using your existing social media account (like Facebook or Google) to log in to a different app or website.