PGP puts your email or files in a digital envelope that only the intended recipient with a copy of PGP can decipher. Anybody else sees a random-looking sequence of ASCII characters. This process of encryption allows you to open digital envelopes encrypted to your public key. This is the reverse of the decryption process.
Many products have "secure" modes that allegedly provide secure information storage and transmission. Unfortunately, most of those products are susceptible to "password cracker" programs readily available at various Internet sites either in freeware form, often aimed at the black-hat community, or as commercial ware marketed to corporate help desks who help their users figure out the passwords they forgot. Law enforcement uses password-crackerprograms, too. If your "secure" product is one that can be cracked this way, it isn't secure.
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