a thin crisp wafer made of flour and water with or without leavening and shortening; unsweetened or semisweet
"She dipped her saltine cracker into the bowl of creamy soup before taking a bite."
a programmer who cracks (gains unauthorized access to) computers, typically to do malicious things
"crackers are often mistakenly called hackers"
firework consisting of a small explosive charge and fuse in a heavy paper casing
"The kids were thrilled to light up the cracker, watching it hiss and pop before bursting into sparks."
a party favor consisting of a paper roll (usually containing candy or a small favor) that pops when pulled at both ends
"The kids were delighted to find a festive cracker filled with miniature marshmallows on the Christmas tree."
A dry, thin, crispy baked bread (usually salty or savoury, but sometimes sweet, as in the case of graham crackers and animal crackers).
"I reached for a salted cracker to dip into my soup."