Post and courier businesses collect, sort and deliver letters, documents and parcels for individuals and organisations. Services may include standard and express delivery, scheduled collections, tracked shipments and proof of delivery. Some handle local or same-day consignments, while others provide national and international delivery through road, air or other transport networks. Customers may also find parcel packing, labelling, returns handling, mailbox services and assistance with customs paperwork for items sent overseas. Business-focused providers can arrange regular collections, bulk mail processing and distribution of documents or goods to multiple addresses. The range of services, delivery times, size limits and tracking options varies between providers, and some items may be restricted or require special handling.