what is a silent auction

{"cid":"91219721","title":"Charity Fundraising Gala Party Marquee Tent Auction Display Silent Bid European Philanthropy Event Canopy Structure","imgUrl":"https:\/\/img.chinax.com\/nimg\/53\/51\/ccf47602e9949ddd4c3736f231c4-200x200-1.jpg","attrs":{"Price":"USD 55-85 per Square Meter","Brand Name":"Tendars","Model Number":"TDT-CHARITY-GALA","Minimum Order Quantity":"25 Square Meters","Delivery Time":"15-25 working days","Supply Ability":"50000 Square Meters per Month","Donor Wall":"Recognition display panel","Frame Material":"Hard Pressed Extruded Aluminum Alloy 6061 T6","Silent Bid":"Power and WiFi for bidding tablets","Place of Origin":"Guangdong, China","Auction Display":"Dedicated item showcase area","Dining":"Premium round table configuration","Certification":"CE, ISO 9001, B1 Fire Retardant","Live Auction":"Stage with auctioneer podium","Payment Terms":"T\/T, L\/C, Western Union charity payment terms available","Packaging Details":"Auction display components in dedicated cases; donor wall panels separately packed; dining equipment in labeled cartons"}}

{"cid":"91219454","title":"Large Cello\/Cellophane Bags,30x 40 Inches Clear Basket Bags OPP Plastic Cellophane Wrap For Gift Baskets Packaging","imgUrl":"https:\/\/img.chinax.com\/nimg\/3d\/e3\/1e6b0fce4a68108865c8c7437b19-200x200-1.jpg","attrs":{"Price":"NEGOTIABLE","Brand Name":"BAGPLASTICS@VIP.163.COM","Model Number":"WHATSAPP: +8613780964661","Minimum Order Quantity":"1000","Delivery Time":"15 DAYS","Certification":"ISO 9001:2015, FDA, HACCP, SGS, EN13432","Place of Origin":"CHINA","Payment Terms":"T\/T, Western Union","Supply Ability":"1 MILLION PER MONTH","Packaging Details":"2000PCS\/CARTON","PARTYWARE":"ALUMINIUM FOIL CONTAINER","BAKEWARE":"ALUMINIUM CONTAINER","DINNERWARE":"FOIL CONTAINER","TABLEWARE":"FOIL ROLL WRAP","KITCHEWARE":"ROLL WRAP","PLASTICWARE":"PVC WRAP","HOUSEWARE":"PE WRAP","FOIL ROLL":"FRESH WRAP","FOIL WRAP":"PARCHMENT PAPER","PARTY SUPPLIES":"ALUMINIUM ROLL"}}