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

Silica Packets - Burbank Recycling Guide

USAGE DIRECTIONS: Each 2 gram packet can cover approx.1 gallon/ 0.14 cu.ft. volume container. We recommend adding extra packets than suggested for

Desiccant Packs 100 Packets 2 Gram Premium Silica Gel Moisture Absorber for Storage Food Contact Safes

For Serious Crunch, Store Your Snacks With Silica Gel Packets

What is Silica Gel? Definition, Uses, & Safety Information

What is silica gel, and why do I find little packets? - Quora

What Would Happen If You Accidentally Ate A Silica Gel Packet?

Silica gel - Wikipedia

Why you should never throw away those little silica packets - Chronicle Live

You should save those silica gel packets that come with your purchases. Here's why