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+.Dd July 17, 2014
+.Dt BIO 3
+.Os
+.Sh NAME
+.Nm BIO
+.Nd I/O abstraction
+.Sh SYNOPSIS
+.In openssl/bio.h
+.Sh DESCRIPTION
+A BIO is an I/O abstraction,
+it hides many of the underlying I/O details from an application.
+If an application uses a BIO for its I/O, it can transparently handle
+SSL connections, unencrypted network connections and file I/O.
+.Pp
+There are two types of BIO, a source/sink BIO and a filter BIO.
+.Pp
+As its name implies, a source/sink BIO is a source and/or sink of data,
+examples include a socket BIO and a file BIO.
+.Pp
+A filter BIO takes data from one BIO and passes it through
+to another, or to the application.
+The data may be left unmodified (for example a message digest BIO)
+or translated (for example an encryption BIO).
+The effect of a filter BIO may change according to the I/O operation
+it is performing: for example an encryption BIO will encrypt data
+if it is being written to and decrypt data if it is being read from.
+.Pp
+BIOs can be joined together to form a chain
+(a single BIO is a chain with one component).
+A chain normally consist of one source/sink BIO
+and one or more filter BIOs.
+Data read from or written to the first BIO then traverses the chain
+to the end (normally a source/sink BIO).
+.Sh SEE ALSO
+.Xr BIO_ctrl 3 ,
+.Xr BIO_f_base64 3 ,
+.Xr BIO_f_buffer 3 ,
+.Xr BIO_f_cipher 3 ,
+.Xr BIO_f_md 3 ,
+.Xr BIO_f_null 3 ,
+.Xr BIO_f_ssl 3 ,
+.Xr BIO_find_type 3 ,
+.Xr BIO_new 3 ,
+.Xr BIO_new_bio_pair 3 ,
+.Xr BIO_push 3 ,
+.Xr BIO_read 3 ,
+.Xr BIO_s_accept 3 ,
+.Xr BIO_s_bio 3 ,
+.Xr BIO_s_connect 3 ,
+.Xr BIO_s_fd 3 ,
+.Xr BIO_s_file 3 ,
+.Xr BIO_s_mem 3 ,
+.Xr BIO_s_null 3 ,
+.Xr BIO_s_socket 3 ,
+.Xr BIO_set_callback 3 ,
+.Xr BIO_should_retry 3