What is silica gel and why do I find little packets of it in everything I buy?

Many of the things I buy contain little packets of crystals. Some of them actually say 'Silica Gel' on them, but many are unlabeled or say something like, 'Do not eat.' I have found these packets in electronics, vitamins and even in some pepperoni I bought last week! What is this stuff? Is it poisonous?
Many of the things I buy contain little packets of crystals. Some of them actually say "Silica Gel" on them, but many are unlabeled or say something like, "Do not eat." I have found these packets in electronics, vitamins and even in some pepperoni I

Understanding Desiccants: Function & Types - Edco Supply Co

Don't Be Afraid of Silica Gel Packs—You Can Do Cool Things with Them!

Silica Gel – you only need to follow half of the directions. (Just ignore the other half.) - The V Spot

100 Packets 3 g Grams Silica Gel Desiccant Pack Moisture Absorber Ship from USA

What Happens If You Eat Silica Gel? Adults, Children, and Pets

For Serious Crunch, Store Your Snacks With Silica Gel Packets

What is silica gel & why do your products need them? - KIT SA

7 Surprising Uses for Silica Gel Packets - Electrodry Blogs

Sachet indicating 20g - Buy online at Silica gel Shop